Factors of 45

The factors of 45 are 1, 3, 5, 9, 15 and 45. That is 6 factors in total.

A factor of 45 is a whole number that divides 45 exactly, with no remainder. 45 is a composite number because it has factors other than 1 and itself.

Factor pairs of 45

Two numbers that multiply to give 45:

• 1 × 45 = 45
• 3 × 15 = 45
• 5 × 9 = 45

Prime factorization of 45

45 = 3 × 3 × 5 = 3² × 5. The prime factors of 45 are 3 and 5.

Quick facts about 45

• Is 45 prime? No.
• Even or odd: odd.
• Sum of its factors: 1 + 3 + 5 + 9 + 15 + 45 = 78.

Factors of nearby numbers

More about 45: 45 squared · square root of 45 · 45 in binary · 45 in Roman numerals.

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