This article discusses the number one. For the year AD 1, see 1. For other uses of 1, see 1 (disambiguation)

{| width="250" border="1" style="float: right; background: #feffff; border-collapse: collapse; margin: 0.5em" Cardinal 1
one Ordinal 1st
first Numeral system unary Factorization $1$ Divisors 1 Roman numeral I Unicode representation of Roman numeral Ⅰ, ⅰ prefixes mono- (from Greek) uni- (from Latin) Binary 1 Octal 1 Duodecimal 1 Hexadecimal 1 Hebrew א (Alef)

1 (one) is a number, numeral, and the name of the glyph representing that number. It is the natural number following 0 and preceding 2. It represents a single entity. One is sometimes referred to as unity, unit or Integer is sometimes used as an adjective in this sense. (For example, a line segment of "unit length" is a line segment of length 1.)

Written out

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one : English

一 : Chinese

un : French

ein : German

ένας : Greek

uno : Italian and Spanish

1 つ : Japanese

1개 : Korean

um : Portuguese

одно : Russian

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