odd, prime · 401st positive integer
The number 401
401 is an odd prime number. It is the 401st positive integer.
Quick reference
| Prime factorization | 401 (prime) |
| Divisors | 1, 401 |
| Binary | 110010001 |
| Hexadecimal | 0x191 |
| Roman numeral | CDI |
| Digit sum | 5 |
| Properties | odd, prime |
Frequently asked
Is 401 a prime number?
Yes. 401 is prime — its only divisors are 1 and itself.
What are the factors of 401?
The factors (divisors) of 401 are 1, 401.
What is 401 in binary?
401 in binary is 110010001. In hexadecimal it's 191.
What is 401 as a Roman numeral?
401 in Roman numerals is CDI.
What's the digit sum of 401?
Adding the digits of 401: 4 + 0 + 1 = 5.