13 in Binary, Roman numerals, Hexadecimal & More
The number 13 is 1101 in binary, XIII in Roman numerals, D in hexadecimal and 15 in octal.
13 decimal = 1101 binary
13 in every number system
| System | Written as |
|---|---|
| Binary (base 2) | 1101 |
| Roman numerals | XIII |
| Hexadecimal (base 16) | D |
| Octal (base 8) | 15 |
| Duodecimal (base 12) | 11 |
| Ternary (base 3) | 111 |
| Base 36 | D |
| Vigesimal (base 20) | D |
| Quaternary (base 4) | 31 |
| Quinary (base 5) | 23 |
| Senary (base 6) | 21 |
About the number 13
- 13 is an odd number.
- 13 is a prime number.
- Written in binary it needs 4 bits, so it fits in one byte.