Factors of 99
There are 6 factors of 99 — the full list is below, with factor pairs, prime factorization, and divisibility notes.
Factors of 99
1, 3, 9, 11, 33, 99
Factor pairs of 99
- 1 × 99
- 3 × 33
- 9 × 11
Prime factorization of 99
99 = 3² × 11
Number facts
- 99 is a composite number.
- 99 has 6 factors.
- 99 is not a perfect square.
- The sum of all factors of 99 is 156.
Divisibility rules that apply to 99
- 99 is divisible by 3 because the sum of its digits (18) is divisible by 3.
- 99 is divisible by 9 because the sum of its digits (18) is divisible by 9.
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How the factors of 99 are calculated
To find the factors of 99, every whole number from 1 up to the square root of 99(about 9.95) is tested for even division. 99 is odd, and it divides evenly by 3, 9, 11, 33. Written as a product of primes, 99 = 3² × 11, which confirms every factor above is a combination of those prime building blocks.
Frequently asked questions about 99
How many factors does 99 have?
99 has 6 factors: 1, 3, 9, 11, 33, 99.
Is 99 a prime number?
No. 99 is composite because it has factors other than 1 and itself.
What are the factor pairs of 99?
The factor pairs of 99 are 1 × 99, 3 × 33, 9 × 11.
What is the prime factorization of 99?
The prime factorization of 99 is 3² × 11.