381 in words
381
three hundred and eighty-one
381 is written three hundred and eighty-one.
Ways to write it
- As an ordinal
- three hundred and eighty-first
- Roman numeral
- CCCLXXXI
- Expanded form
- 300 + 80 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 3 | 300 |
| tens | 8 | 80 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 127 and 381 (4 factors)
- First 10 multiples
- 381, 762, 1,143, 1,524, 1,905, 2,286, 2,667, 3,048, 3,429, 3,810
- Square
- 381 × 381 = 145,161
- Square root
- ≈ 19.52
- Sum of the digits
- 3 + 8 + 1 = 12
- Rounded to the nearest 10
- 380
- Rounded to the nearest 100
- 400
- Number before
- 380
- Number after
- 382
- In binary
101111101
Quick check
What number comes just after 381?
Show the answer
382
Is 381 even or odd?
Show the answer
Odd
What is 381 + 10?
Show the answer
391
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 381 in words?
381 is written "three hundred and eighty-one".
Is 381 a prime number?
No. 381 is a composite number, because it has more than two factors.
What are the factors of 381?
The factors of 381 are 1, 3, 127 and 381.
How do you write 381 in Roman numerals?
381 in Roman numerals is CCCLXXXI.