−1

Cardinal−1, minus one, negative oneOrdinal−1st (negative first)Divisors1Arabic−١Chinese numeral负一，负弌，负壹Bengali−১Binary (byte)Hex (byte)

In mathematics, −1 (negative one or minus one) is the additive inverse of 1, that is, the number that when added to 1 gives the additive identity element, 0. It is the negativeinteger greater than negative two (−2) and less than 0.