1,231 in words
1,231
one thousand two hundred and thirty-one
1,231 is written one thousand two hundred and thirty-one.
Ways to write it
- As an ordinal
- one thousand two hundred and thirty-first
- Roman numeral
- MCCXXXI
- Expanded form
- 1,000 + 200 + 30 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| thousands | 1 | 1,000 |
| hundreds | 2 | 200 |
| tens | 3 | 30 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 1,231 (2 factors)
- First 10 multiples
- 1,231, 2,462, 3,693, 4,924, 6,155, 7,386, 8,617, 9,848, 11,079, 12,310
- Square
- 1,231 × 1,231 = 1,515,361
- Square root
- ≈ 35.09
- Sum of the digits
- 1 + 2 + 3 + 1 = 7
- Rounded to the nearest 10
- 1,230
- Rounded to the nearest 100
- 1,200
- Rounded to the nearest 1000
- 1,000
- Number before
- 1,230
- Number after
- 1,232
- In binary
10011001111
Quick check
What number comes just after 1,231?
Show the answer
1,232
Is 1,231 even or odd?
Show the answer
Odd
What is 1,231 + 10?
Show the answer
1,241
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 1,231 in words?
1,231 is written "one thousand two hundred and thirty-one".
Is 1,231 a prime number?
Yes. 1,231 is a prime number: its only factors are 1 and 1,231.
What are the factors of 1,231?
The factors of 1,231 are 1 and 1,231.
How do you write 1,231 in Roman numerals?
1,231 in Roman numerals is MCCXXXI.