813 in words
813
eight hundred and thirteen
813 is written eight hundred and thirteen.
Ways to write it
- As an ordinal
- eight hundred and thirteenth
- Roman numeral
- DCCCXIII
- Expanded form
- 800 + 10 + 3
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 8 | 800 |
| tens | 1 | 10 |
| ones | 3 | 3 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 271 and 813 (4 factors)
- First 10 multiples
- 813, 1,626, 2,439, 3,252, 4,065, 4,878, 5,691, 6,504, 7,317, 8,130
- Square
- 813 × 813 = 660,969
- Square root
- ≈ 28.51
- Sum of the digits
- 8 + 1 + 3 = 12
- Rounded to the nearest 10
- 810
- Rounded to the nearest 100
- 800
- Number before
- 812
- Number after
- 814
- In binary
1100101101
Quick check
What number comes just after 813?
Show the answer
814
Is 813 even or odd?
Show the answer
Odd
What is 813 + 10?
Show the answer
823
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 813 in words?
813 is written "eight hundred and thirteen".
Is 813 a prime number?
No. 813 is a composite number, because it has more than two factors.
What are the factors of 813?
The factors of 813 are 1, 3, 271 and 813.
How do you write 813 in Roman numerals?
813 in Roman numerals is DCCCXIII.