1,000,000,000

1000000000
List of numbers Integers ← 100 101 102 103 104 105 106 107 108 109
Cardinal	One billion (short scale) One thousand million, or one milliard (long scale)
Ordinal	One billionth (short scale)
Factorization	29 59
Greek numeral	${\displaystyle {\stackrel {\iota }{\mathrm {M} }}}$
Roman numeral	M
Binary	1110111001101011001010000000002
Ternary	21202002000210100013
Senary	2431212453446
Octal	73465450008
Duodecimal	23AA9385412
Hexadecimal	3B9ACA0016

1,000,000,000 (one billion, short scale; one thousand million or one milliard, one yard,^[1] long scale) is the natural number following 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as b, bil^{[citation needed]} or bn.^[2][3]

In standard form, it is written as 1 × 10⁹. The metric prefix giga indicates 1,000,000,000 times the base unit. Its symbol is G.

One billion years may be called an eon in astronomy or geology.

Previously in British English (but not in American English), the word "billion" referred exclusively to a million millions (1,000,000,000,000). However, this is not common anymore, and the word has been used to mean one thousand million (1,000,000,000) for several decades.^[4]

The term milliard could also be used to refer to 1,000,000,000; whereas "milliard" is rarely used in English,^[5] variations on this name often appear in other languages.

In the Indian numbering system, it is known as 100 crore or 1 arab.

1,000,000,000 is also the cube of 1000.