31 in Roman Numerals
31 in Roman numerals is XXXI. It is built from two parts: 30 + 1 = XXX + I. Read it from left to right and add the values to get 31. Copy it below, see why it is written this way, and check the numbers before and after. The converter handles any number from 1 to 3,999.
31 in Roman numerals is XXXI.
31 in Roman numerals: the breakdown
| Place value | Numeral | Value |
|---|---|---|
| 30 | XXX | 30 |
| 1 | I | 1 |
| Total | XXXI | 31 |
30 plus 1 is 31, so XXX followed by I is XXXI.
How to read XXXI
- XXX is 10 + 10 + 10, which is 30.
- I is 1.
- Add 30 + 1 to get 31.
The numbers around 31
Facts about 31
- 31 is an odd number.
- 31 is a prime number: it can be divided only by 1 and itself.
- The digits of 31 add up to 4.
- XXXI is 4 letters long. It uses the symbols X and I.
Convert another number
31 = 30 + 1 = XXX + I
What number is XXXI?
XXXI is the number 31. Reading it from left to right, XXX is 30 and I is 1, which adds up to 31.
Questions and answers
What is 31 in Roman numerals?
31 in Roman numerals is XXXI. It is made of two parts: 30 + 1 = XXX + I. Read XXXI from left to right, add the parts, and you get 31. Use the converter on this page to check any other number from 1 to 3,999.
How do you write 31 in Roman numerals?
Split 31 into its place values, write each one in Roman numerals, and join them from largest to smallest. For 31 that is 30 + 1, which is XXX + I, so the answer is XXXI. Check that no letter repeats more than three times in a row.
What number is XXXI?
XXXI is 31. Read it in place-value parts from left to right: XXX is 30, I is 1. Add the parts to get 31. Letters after a larger or equal letter are added, and a smaller letter before a larger one is subtracted. You can also type XXXI into the converter to read the number back.