491 in words
491
four hundred and ninety-one
491 is written four hundred and ninety-one.
Ways to write it
- As an ordinal
- four hundred and ninety-first
- Roman numeral
- CDXCI
- Expanded form
- 400 + 90 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 4 | 400 |
| tens | 9 | 90 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 491 (2 factors)
- First 10 multiples
- 491, 982, 1,473, 1,964, 2,455, 2,946, 3,437, 3,928, 4,419, 4,910
- Square
- 491 × 491 = 241,081
- Square root
- ≈ 22.16
- Sum of the digits
- 4 + 9 + 1 = 14
- Rounded to the nearest 10
- 490
- Rounded to the nearest 100
- 500
- Number before
- 490
- Number after
- 492
- In binary
111101011
Quick check
What number comes just after 491?
Show the answer
492
Is 491 even or odd?
Show the answer
Odd
What is 491 + 10?
Show the answer
501
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 491 in words?
491 is written "four hundred and ninety-one".
Is 491 a prime number?
Yes. 491 is a prime number: its only factors are 1 and 491.
What are the factors of 491?
The factors of 491 are 1 and 491.
How do you write 491 in Roman numerals?
491 in Roman numerals is CDXCI.