Factors of 45
45 has 6 factors.
All factors of 45
1, 3, 5, 9, 15, 45
Prime factorization: 3² × 5
Number of factors
6
Sum of factors
78
Prime?
No
Factor pairs of 45
Each pair multiplies together to make 45:
| Pair | Product |
|---|---|
| 1 × 45 | 45 |
| 3 × 15 | 45 |
| 5 × 9 | 45 |
Factors of nearby numbers
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Frequently asked questions
What are the factors of 45?+
The factors of 45 are 1, 3, 5, 9, 15, 45 — that is 6 factors in total.
What is the prime factorization of 45?+
The prime factorization of 45 is 3² × 5.
Is 45 a prime number?+
No. 45 has 6 factors, more than just 1 and itself, so it is a composite number.