Factors of 155
The factors of 155 are 1, 5, 31, 155. It has 4 factors.
Factors of 155
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 155 is a whole number that divides it with nothing left over. You only need to test the numbers up to ā155 ā 12.45; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 4 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: 1 + 5 + 31 + 155 = 192. Without 155 itself that is 37, so 155 is a deficient number.
LaTeX source of the formulas on this page
\[ 155 = 5 \times 31 \]
Factor pairs of 155
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 155 | 1 Ć 155 = 155 |
| 5 | 31 | 5 Ć 31 = 155 |
Questions
What are the factors of 155?
The factors of 155 are 1, 5, 31, 155. It has 4 factors.
What are the prime factors of 155?
5, 31. As a product: 5 Ć 31.
How many factors does 155 have?
155 has 4 factors (2 factor pairs).
What is the sum of the factors of 155?
192.
Is 155 a prime number?
No. It is divisible by 5, so 155 = 5 Ć 31.