9 (number)

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8910
−1 0 1 2 3 4 5 6 7 8 9
Cardinalnine
Ordinal9th
(ninth)
Factorization32
Roman numeralIX
Unicode symbol(s)Ⅸ, ⅸ
Greek prefixennea-
Latin prefixnona-
Binary10012
Ternary1003
Quaternary214
Quinary145
Senary136
Octal118
Duodecimal912
Hexadecimal916
Vigesimal920
Base 36936
Amharic
Arabicl٩
Urdu۹
Armenian numeralԹ
Bengali
Chinese/Japanese
/Korean numeral
九 (jiu)
玖 (formal writing)
Devanāgarī (nau)
Greek numeralθ´
Hebrew numeralט (Tet)
Tamil numerals
Khmer
Telugu numeral
Thai numeral
 
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8910
−1 0 1 2 3 4 5 6 7 8 9
Cardinalnine
Ordinal9th
(ninth)
Factorization32
Roman numeralIX
Unicode symbol(s)Ⅸ, ⅸ
Greek prefixennea-
Latin prefixnona-
Binary10012
Ternary1003
Quaternary214
Quinary145
Senary136
Octal118
Duodecimal912
Hexadecimal916
Vigesimal920
Base 36936
Amharic
Arabicl٩
Urdu۹
Armenian numeralԹ
Bengali
Chinese/Japanese
/Korean numeral
九 (jiu)
玖 (formal writing)
Devanāgarī (nau)
Greek numeralθ´
Hebrew numeralט (Tet)
Tamil numerals
Khmer
Telugu numeral
Thai numeral

9 (nine /ˈnn/) is the natural number following 8 and preceding 10.

Alphabets and codes[edit]

Companies[edit]

Culture and mythology[edit]

Chinese culture[edit]

Ancient Egypt[edit]

European culture[edit]

Greek Mythology[edit]

Japanese culture[edit]

Evolution of the glyph[edit]

According to Georges Ifrah, the origin of the 9 integers can be attributed to the ancient Indian civilization, and was adopted by subsequent civilizations in conjunction with the 0.[3]

Evo9glyph.svg

In the beginning, various Indians wrote 9 similar to the modern closing question mark without the bottom dot. The Kshatrapa, Andhra and Gupta started curving the bottom vertical line coming up with a 3-look-alike. The Nagari continued the bottom stroke to make a circle and enclose the 3-look-alike, in much the same way that the @ character encircles a lowercase a. As time went on, the enclosing circle became bigger and its line continued beyond the circle downwards, as the 3-look-alike became smaller. Soon, all that was left of the 3-look-alike was a squiggle. The Arabs simply connected that squiggle to the downward stroke at the middle and subsequent European change was purely cosmetic.

While the shape of the 9 character has an ascender in most modern typefaces, in typefaces with text figures the character usually has a descender, as, for example, in TextFigs196.png.

This numeral resembles an inverted 6. To disambiguate the two on objects and documents that can be inverted, the 9 is often underlined, as is done for the 6. Another distinction from the 6 is that it is often handwritten with a straight stem.

Idioms and popular phrases[edit]

"A stitch in time saves Nine"

Internet[edit]

Literature[edit]

Mathematics[edit]

Nine is a composite number, its proper divisors being 1 and 3. It is 3 times 3 and hence the third square number. Nine is a Motzkin number. It is the first composite lucky number, along with the first composite odd number.

Nine is the highest single-digit number in the decimal system. It is the second non-unitary square prime of the form (p2) and the first that is odd. All subsequent squares of this form are odd. It has a unique aliquot sum 4 which is itself a square prime. Nine is; and can be, the only square prime with an aliquot sum of the same form. The aliquot sequence of nine has 5 members (9,4,3,1,0) this number being the second composite member of the 3-aliquot tree. It is the aliquot sum of only one number the discrete semiprime 15.

There are nine Heegner numbers.[7]

Since 9 = 321, 9 is an exponential factorial.

8 and 9 form a Ruth-Aaron pair under the second definition that counts repeated prime factors as often as they occur.

In bases 12, 18 and 24, nine is a 1-automorphic number and in base 6 a 2-automorphic number (displayed as '13').

A polygon with nine sides is called a nonagon or enneagon.[8] A group of nine of anything is called an ennead.

In base 10 a positive number is divisible by nine if and only if its digital root is 9.[9] That is, if you multiply nine by any natural number, and repeatedly add the digits of the answer until it is just one digit, you will end up with nine:

There are other interesting patterns involving multiples of nine:

This works for all the multiples of 9. n = 3 is the only other n > 1 such that a number is divisible by n if and only if its digital root is n. In base N, the divisors of N − 1 have this property. Another consequence of 9 being 10 − 1, is that it is also a Kaprekar number.

The difference between a base-10 positive integer and the sum of its digits is a whole multiple of nine. Examples:

Subtracting two base-10 positive integers that are transpositions of each other yields a number that is a whole multiple of nine. Examples:

This works regardless of the number of digits that are transposed. For example, the largest transposition of 35967930 is 99765330 (all digits in descending order) and its smallest transposition is 03356799 (all digits in ascending order); subtracting pairs of these numbers produces:

Casting out nines is a quick way of testing the calculations of sums, differences, products, and quotients of integers, known as long ago as the 12th Century.[10]

Every prime in a Cunningham chain of the first kind with a length of 4 or greater is congruent to 9 mod 10 (the only exception being the chain 2, 5, 11, 23, 47).

Six recurring nines appear in the decimal places 762 through 767 of pi. This is known as the Feynman point.

If an odd perfect number is of the form 36k + 9, it has at least nine distinct prime factors.[11]

If you divide a number by the amount of 9s corresponding to its number of digits, the number is turned into a repeating decimal. (e.g. 274/999 = 0.274274274274...)

Nine is the binary complement of number six:

 9 = 1001 6 = 0110 

List of basic calculations[edit]

Multiplication12345678910111213141516171819202122232425501001000
9 \times x9182736455463728190991081171261351441531621711801891982072162254509009000
Division123456789101112131415
9 \div x94.532.251.81.51.2857141.12510.90.810.750.6923070.64285710.6
x \div 90.10.20.30.40.50.60.70.811.11.21.31.41.51.6
Exponentiation12345678910111213
9 ^ x\,9817296561590495314414782969430467213874204893486784401313810596092824295364812541865828329
x ^ 9\,1512196832621441953125100776964035360713421772838742048910000000002357947691515978035210604499373
Radix151015202530405060708090100
1101201301401502002505001000100001000001000000
x_{9} \ 1511916922927933944955966977988911091219
1329143915491659176924293079615913319146419162151917836619

Numeral systems[edit]

BaseNumeral system
2binary1001
3ternary100
4quaternary21
5quinary14
6senary13
7septenary12
8octal11
9novenary10
over 9 (decimal, hexadecimal)9

Probability[edit]

In probability, the nine is a logarithmic measure of probability of an event, defined as the negative of the base-10 logarithm of the probability of the event's complement. For example, an event that is 99% likely to occur has an unlikelihood of 1% or 0.01, which amounts to −log10 0.01 = 2 nines of probability. Zero probability gives zero nines (−log10 1 = 0). A 100% probability is considered to be impossible in most circumstances: that results in infinite improbability. The effectivity of processes and the availability of systems can be expressed (as a rule of thumb, not explicitly) as a series of "nines". For example, "five nines" (99.999%) availability implies a total downtime of no more than five minutes per year - typically a very high degree of reliability; but never 100%.

Organizations[edit]

Places and thoroughfares[edit]

Religion and philosophy[edit]

A nine-pointed star

Science[edit]

Astronomy[edit]

Chemistry[edit]

Physiology[edit]

A human pregnancy normally lasts nine months, the basis of the Naegele's rule.

Sports[edit]

A Nine-ball rack with the 9 ball at the center

Auto racing[edit]

Baseball[edit]

Billiards[edit]

Rugby[edit]

Soccer[edit]

All sports[edit]

The jersey number 9 has been retired by several North American sports teams in honor of past playing greats (or in one case, an owner):

Technology[edit]

Seven-segment 9.svg
Seven-segment 9 alt.svg

Other fields[edit]

Playing cards showing the 9 of all four suits

See also[edit]

References[edit]

  1. ^ Nine West http://www.ninewest.com/
  2. ^ Donald Alexander Mackenzie (2005). Myths of China And Japan. Kessinger. ISBN 1-4179-6429-4. 
  3. ^ Georges Ifrah (1985). From One to Zero: A Universal History of Numbers. Viking. ISBN 0-670-37395-8. 
  4. ^ Jane Dowson (1996). Women's Poetry of the 1930s: A Critical Anthology. Routledge. ISBN 0-415-13095-6. 
  5. ^ Anthea Fraser (1988). The Nine Bright Shiners. Doubleday. ISBN 0-385-24323-5. 
  6. ^ Charles Herbert Malden (1905). Recollections of an Eton Colleger, 1898-1902. Spottiswoode. 
  7. ^ Bryan Bunch, The Kingdom of Infinite Number. New York: W. H. Freeman & Company (2000): 93
  8. ^ Robert Dixon, Mathographics. New York: Courier Dover Publications: 24
  9. ^ Martin Gardner, A Gardner's Workout: Training the Mind and Entertaining the Spirit. New York: A. K. Peters (2001): 155
  10. ^ Cajori, Florian (1991, 5e) A History of Mathematics, AMS. ISBN 0-8218-2102-4. p.91
  11. ^ Eyob Delele Yirdaw, "Proving Touchard's Theorem from Euler's Form" ArXiv preprint.
  12. ^ "Web site for NINE: A Journal of Baseball History & Culture". Retrieved 20 February 2013. 

Further reading[edit]