odd, composite, palindrome · 161st positive integer
The number 161
161 is an odd composite number. It is the 161st positive integer.
Quick reference
| Prime factorization | 7 × 23 |
| Divisors | 1, 7, 23, 161 |
| Binary | 10100001 |
| Hexadecimal | 0xA1 |
| Roman numeral | CLXI |
| Digit sum | 8 |
| Properties | odd, composite, palindrome |
Frequently asked
Is 161 a prime number?
No. 161 is composite. Its prime factorization is 7 × 23.
What are the factors of 161?
The factors (divisors) of 161 are 1, 7, 23, 161.
What is 161 in binary?
161 in binary is 10100001. In hexadecimal it's A1.
What is 161 as a Roman numeral?
161 in Roman numerals is CLXI.
What's the digit sum of 161?
Adding the digits of 161: 1 + 6 + 1 = 8.