Factors of 45

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What are the Factors of 45?

Answer

Factors of 45:

1, 3, 5, 9, 15, 45

6 factors · 45 = 3² × 5 · composite

Underlined — prime: 3, 5 · 1 — neither prime nor composite · others — composite

Factor pairs of 45

3 pairs: 1 × 45 · 3 × 15 · 5 × 9

Past √45 ≈ 6.71 every pair would repeat one already found — so checking stops at 6.

45 = 3² × 5 → (2 + 1) × (1 + 1) = 6 factors: add 1 to each exponent and multiply.

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See Also

Prime Number Checker - Find out whether a given number is Prime or not
Prime Factorization - Prime Factorization Calculator
Prime Numbers List - List of all Prime Numbers - how many Prime numbers are between

Recalculate with different values ↑

Factors Table

Number	Factors
30	1, 2, 3, 5, 6, 10, 15, 30
31	1, 31
32	1, 2, 4, 8, 16, 32
33	1, 3, 11, 33
34	1, 2, 17, 34
35	1, 5, 7, 35
36	1, 2, 3, 4, 6, 9, 12, 18, 36
37	1, 37
38	1, 2, 19, 38
39	1, 3, 13, 39
40	1, 2, 4, 5, 8, 10, 20, 40
41	1, 41
42	1, 2, 3, 6, 7, 14, 21, 42
43	1, 43
44	1, 2, 4, 11, 22, 44
45	1, 3, 5, 9, 15, 45
46	1, 2, 23, 46
47	1, 47
48	1, 2, 3, 4, 6, 8, 12, 16, 24, 48
49	1, 7, 49
50	1, 2, 5, 10, 25, 50
51	1, 3, 17, 51
52	1, 2, 4, 13, 26, 52
53	1, 53
54	1, 2, 3, 6, 9, 18, 27, 54
55	1, 5, 11, 55
56	1, 2, 4, 7, 8, 14, 28, 56
57	1, 3, 19, 57
58	1, 2, 29, 58
59	1, 59

FAQ

What are the Factors of 45?

Factors of 45: 1, 3, 5, 9, 15, 45

How many factors does 45 have?

Number 45 has 6 factors

How many Factor Pairs does 45 have?

Number 45 has 3 factor pairs

Is 45 a prime or composite number?

Composite: 45 = 3² × 5, so it has 6 factors — a prime has exactly two.

How many factors does 45 have excluding 1 and 45?

4: 3, 5, 9 and 15.