odd, composite, triangular · 861st positive integer
The number 861
861 is an odd composite number. It is the 861st positive integer.
Quick reference
| Prime factorization | 3 × 7 × 41 |
| Divisors | 1, 3, 7, 21, 41, 123, 287, 861 |
| Binary | 1101011101 |
| Hexadecimal | 0x35D |
| Roman numeral | DCCCLXI |
| Digit sum | 15 |
| Properties | odd, composite, triangular |
Frequently asked
Is 861 a prime number?
No. 861 is composite. Its prime factorization is 3 × 7 × 41.
What are the factors of 861?
The factors (divisors) of 861 are 1, 3, 7, 21, 41, 123, 287, 861.
What is 861 in binary?
861 in binary is 1101011101. In hexadecimal it's 35D.
What is 861 as a Roman numeral?
861 in Roman numerals is DCCCLXI.
What's the digit sum of 861?
Adding the digits of 861: 8 + 6 + 1 = 15.