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noun. the first and lowest whole number, being a cardinal number; unity. a symbol of this number, as 1 or I. a single person or thing: If only problems would come one at a time! a die face or a domino face having one pip. a one-dollar bill: to change a five-dollar bill for five ones.
In mathematics, the number 1 is the natural number [1] that follows 0 and precedes 2. It is an integer and a cardinal number, that is, a number that is used for counting. [2] . In addition, it is classified as a real number, [3] distinguishing it from imaginary numbers.
1 is an odd number which is uniquely neither prime nor composite. It is known as the multiplicative identity or unit. It’s also the only positive number with no other divisors. Prime factorization of 1: 1. See below for interesting mathematical facts about the number 1 from the Numbermatics database. Quick links:
