Factors of 1155
The factors of 1155 are 1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, 385, 1155. It has 16 factors.
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 1155 is a whole number that divides it with nothing left over. You only need to test the numbers up to √1155 ≈ 33.99; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 16 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: the sum is 2304. Without 1155 itself that is 1149, so 1155 is a deficient number.
LaTeX source of the formulas on this page
\[ 1155 = 3 \times 5 \times 7 \times 11 \]
Factor pairs of 1155
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 1155 | 1 × 1155 = 1155 |
| 3 | 385 | 3 × 385 = 1155 |
| 5 | 231 | 5 × 231 = 1155 |
| 7 | 165 | 7 × 165 = 1155 |
| 11 | 105 | 11 × 105 = 1155 |
| 15 | 77 | 15 × 77 = 1155 |
| 21 | 55 | 21 × 55 = 1155 |
| 33 | 35 | 33 × 35 = 1155 |
Questions
What are the factors of 1155?
The factors of 1155 are 1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, 385, 1155. It has 16 factors.
What are the prime factors of 1155?
3, 5, 7, 11. As a product: 3 × 5 × 7 × 11.
How many factors does 1155 have?
1155 has 16 factors (8 factor pairs).
What is the sum of the factors of 1155?
2304.
Is 1155 a prime number?
No. It is divisible by 3, so 1155 = 3 × 385.