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1000000000  

Cardinal  One billion (short scale) One thousand million, or one milliard (long scale) 
Ordinal  One billionth (short scale) 
Factorization  2^{9} · 5^{9} 
Roman numeral  M 
Binary  111011100110101100101000000000_{2} 
Ternary  2120200200021010001_{3} 
Quaternary  323212230220000_{4} 
Quinary  4022000000000_{5} 
Senary  243121245344_{6} 
Octal  7346545000_{8} 
Duodecimal  23AA93854_{12} 
Hexadecimal  3B9ACA00_{16} 
Vigesimal  FCA0000_{20} 
Base 36  GJDGXS_{36} 
1000000000  

Cardinal  One billion (short scale) One thousand million, or one milliard (long scale) 
Ordinal  One billionth (short scale) 
Factorization  2^{9} · 5^{9} 
Roman numeral  M 
Binary  111011100110101100101000000000_{2} 
Ternary  2120200200021010001_{3} 
Quaternary  323212230220000_{4} 
Quinary  4022000000000_{5} 
Senary  243121245344_{6} 
Octal  7346545000_{8} 
Duodecimal  23AA93854_{12} 
Hexadecimal  3B9ACA00_{16} 
Vigesimal  FCA0000_{20} 
Base 36  GJDGXS_{36} 
1,000,000,000 (one billion, short scale; one thousand million or milliard, long scale) is the natural number following 999,999,999 and preceding 1,000,000,001.
In scientific notation, it is written as "1 × 10^{9}".
Previously in British English (but not in American English), the word "billion" referred to a million millions (1,000,000,000,000). However, this is no longer the case, and the word has been used unambiguously to mean one thousand million (1,000,000,000) for some time.^{[1]}^{[2]} The alternative term "one thousand million" is rare and is used primarily to ease understanding among nonnative speakers of English, as many other languages use words similar to "billion" (e.g. Spanish billón) to mean one trillion (1,000,000,000,000 or a million millions).
In the South Asian numbering system, it is known as 100 crore or 1 arab.
The term milliard can also be used to refer to 1,000,000,000; though "milliard" is very seldom used in English, variations on this name often appear in other languages (e.g. Hungarian (Magyar) milliárd, Indonesian miliar, Polish miliard, Danish milliard, Spanish millardo, French milliard, Italian miliardo, German Milliarde, Hebrew מיליארד, Finnish miljardi, Dutch miljard, SerboCroatian milijarda , Russian миллиард, Czech miliarda, Arabic مليار, Romanian miliard, Swedish miljard Norwegian "milliard").
The SI prefix giga indicates 1,000,000,000 times the base unit.
See Orders of magnitude (numbers) for larger numbers; and long and short scales.
The facts below give a sense of how large 1,000,000,000 (10^{9}) is in the context of time according to current scientific evidence:
In terms of distance:
In terms of finance:
In terms of area:
In terms of volume:
In terms of natural landscape; a small mountain, slightly larger than Stone Mountain Georgia, United States, would weigh (have a mass of) a billion tons.
In terms of count:
A is a cube; B consists of 1000 cubes of type A. C consists of 1000 Bs; and D 1000 Cs. Thus there are 1 million As in C; and 1,000,000,000 As in D.
