Factors of 9
The factors of 9 are 1, 3, 9. It has 3 factors.
Factors of 9
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 9 is a whole number that divides it with nothing left over. You only need to test the numbers up to √9 ≈ 3.00; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 3 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: 1 + 3 + 9 = 13. Without 9 itself that is 4, so 9 is a deficient number.
LaTeX source of the formulas on this page
\[ 9 = 3^{2} \]Factor pairs of 9
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 9 | 1 × 9 = 9 |
| 3 | 3 | 3 × 3 = 9 |
Questions
What are the factors of 9?
The factors of 9 are 1, 3, 9. It has 3 factors.
What are the prime factors of 9?
3. As a product: .
How many factors does 9 have?
9 has 3 factors (2 factor pairs, one of them 3 × 3).
What is the sum of the factors of 9?
13.
Is 9 a prime number?
No. It is divisible by 3, so 9 = 3 × 3.