31 in Roman Numerals
XXXI
31 in Roman numerals is XXXI, and is spelled thirty-one.
How to write 31 in Roman numerals
To write 31 in Roman numerals, combine XXX (30) and I (1) to get XXXI.
The numeral XXXI is read from left to right, from the largest value to the smallest, adding each symbol as you go.
| Value | Roman |
|---|---|
| 30 | XXX |
| 1 | I |
| 31 | XXXI |
Facts about the number 31
- 31 is an odd number.
- 31 is a prime number: it has no divisors other than 1 and itself.
- The digits of 31 add up to 4.
- 31 has 2 divisors.
31 in other number systems
| Decimal | 31 |
| Roman | XXXI |
| Binary | 11111 |
| Octal | 37 |
| Hexadecimal | 1F |
Frequently asked questions
How do you write 31 in Roman numerals?
31 is written as XXXI in Roman numerals.
What does the Roman numeral XXXI mean?
XXXI represents the number 31 (thirty-one).
Is 31 a prime number?
Yes, 31 is a prime number.
What is 31 in binary and hexadecimal?
31 is 11111 in binary and 1F in hexadecimal.
Related numbers
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