odd, prime · 19th positive integer
The number 19
19 is an odd prime number. It is the 19th positive integer.
Quick reference
| Prime factorization | 19 (prime) |
| Divisors | 1, 19 |
| Binary | 10011 |
| Hexadecimal | 0x13 |
| Roman numeral | XIX |
| Digit sum | 10 |
| Properties | odd, prime |
Frequently asked
Is 19 a prime number?
Yes. 19 is prime — its only divisors are 1 and itself.
What are the factors of 19?
The factors (divisors) of 19 are 1, 19.
What is 19 in binary?
19 in binary is 10011. In hexadecimal it's 13.
What is 19 as a Roman numeral?
19 in Roman numerals is XIX.
What's the digit sum of 19?
Adding the digits of 19: 1 + 9 = 10.