691 in words
691
six hundred and ninety-one
691 is written six hundred and ninety-one.
Ways to write it
- As an ordinal
- six hundred and ninety-first
- Roman numeral
- DCXCI
- Expanded form
- 600 + 90 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 6 | 600 |
| tens | 9 | 90 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 691 (2 factors)
- First 10 multiples
- 691, 1,382, 2,073, 2,764, 3,455, 4,146, 4,837, 5,528, 6,219, 6,910
- Square
- 691 × 691 = 477,481
- Square root
- ≈ 26.29
- Sum of the digits
- 6 + 9 + 1 = 16
- Rounded to the nearest 10
- 690
- Rounded to the nearest 100
- 700
- Number before
- 690
- Number after
- 692
- In binary
1010110011
Quick check
What number comes just after 691?
Show the answer
692
Is 691 even or odd?
Show the answer
Odd
What is 691 + 10?
Show the answer
701
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 691 in words?
691 is written "six hundred and ninety-one".
Is 691 a prime number?
Yes. 691 is a prime number: its only factors are 1 and 691.
What are the factors of 691?
The factors of 691 are 1 and 691.
How do you write 691 in Roman numerals?
691 in Roman numerals is DCXCI.