odd, composite · 155th positive integer
The number 155
155 is an odd composite number. It is the 155th positive integer.
Quick reference
| Prime factorization | 5 × 31 |
| Divisors | 1, 5, 31, 155 |
| Binary | 10011011 |
| Hexadecimal | 0x9B |
| Roman numeral | CLV |
| Digit sum | 11 |
| Properties | odd, composite |
Frequently asked
Is 155 a prime number?
No. 155 is composite. Its prime factorization is 5 × 31.
What are the factors of 155?
The factors (divisors) of 155 are 1, 5, 31, 155.
What is 155 in binary?
155 in binary is 10011011. In hexadecimal it's 9B.
What is 155 as a Roman numeral?
155 in Roman numerals is CLV.
What's the digit sum of 155?
Adding the digits of 155: 1 + 5 + 5 = 11.