Factors of 1

The factors of 1 are 1. That is 1 factor in total.

A factor of 1 is a whole number that divides 1 exactly, with no remainder. 1 has only one factor, itself, so it is neither prime nor composite.

Factor pairs of 1

Two numbers that multiply to give 1:

• 1 × 1 = 1

Quick facts about 1

• Is 1 prime? No.
• Even or odd: odd.
• Sum of its factors: 1 = 1.
• 1 is a perfect square (1 × 1), so it has an odd number of factors.

Factors of nearby numbers

More about 1: 1 squared · square root of 1 · 1 in binary · 1 in Roman numerals.

Another number? Try the prime number checker, the GCF and LCM calculator or see all factor lists.