odd, composite, triangular · 561st positive integer
The number 561
561 is an odd composite number. It is the 561st positive integer.
Quick reference
| Prime factorization | 3 × 11 × 17 |
| Divisors | 1, 3, 11, 17, 33, 51, 187, 561 |
| Binary | 1000110001 |
| Hexadecimal | 0x231 |
| Roman numeral | DLXI |
| Digit sum | 12 |
| Properties | odd, composite, triangular |
Frequently asked
Is 561 a prime number?
No. 561 is composite. Its prime factorization is 3 × 11 × 17.
What are the factors of 561?
The factors (divisors) of 561 are 1, 3, 11, 17, 33, 51, 187, 561.
What is 561 in binary?
561 in binary is 1000110001. In hexadecimal it's 231.
What is 561 as a Roman numeral?
561 in Roman numerals is DLXI.
What's the digit sum of 561?
Adding the digits of 561: 5 + 6 + 1 = 12.