231 in words
231
two hundred thirty-one
231 is written two hundred thirty-one.
Ways to write it
- As an ordinal
- two hundred thirty-first
- Roman numeral
- CCXXXI
- Expanded form
- 200 + 30 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 2 | 200 |
| tens | 3 | 30 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 7, 11, 21, 33, 77 and 231 (8 factors)
- First 10 multiples
- 231, 462, 693, 924, 1,155, 1,386, 1,617, 1,848, 2,079, 2,310
- Square
- 231 × 231 = 53,361
- Square root
- ≈ 15.20
- Sum of the digits
- 2 + 3 + 1 = 6
- Rounded to the nearest 10
- 230
- Rounded to the nearest 100
- 200
- Number before
- 230
- Number after
- 232
- In binary
11100111
Quick check
What number comes just after 231?
Show the answer
232
Is 231 even or odd?
Show the answer
Odd
What is 231 + 10?
Show the answer
241
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Roman Numerals
Read and write Roman numerals from I to 3,999.Frequently asked questions
How do you write 231 in words?
231 is written "two hundred thirty-one".
Is 231 a prime number?
No. 231 is a composite number, because it has more than two factors.
What are the factors of 231?
The factors of 231 are 1, 3, 7, 11, 21, 33, 77 and 231.
How do you write 231 in Roman numerals?
231 in Roman numerals is CCXXXI.