561 in words
561
five hundred sixty-one
561 is written five hundred sixty-one.
Ways to write it
- As an ordinal
- five hundred sixty-first
- Roman numeral
- DLXI
- Expanded form
- 500 + 60 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 5 | 500 |
| tens | 6 | 60 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 11, 17, 33, 51, 187 and 561 (8 factors)
- First 10 multiples
- 561, 1,122, 1,683, 2,244, 2,805, 3,366, 3,927, 4,488, 5,049, 5,610
- Square
- 561 × 561 = 314,721
- Square root
- ≈ 23.69
- Sum of the digits
- 5 + 6 + 1 = 12
- Rounded to the nearest 10
- 560
- Rounded to the nearest 100
- 600
- Number before
- 560
- Number after
- 562
- In binary
1000110001
Quick check
What number comes just after 561?
Show the answer
562
Is 561 even or odd?
Show the answer
Odd
What is 561 + 10?
Show the answer
571
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 561 in words?
561 is written "five hundred sixty-one".
Is 561 a prime number?
No. 561 is a composite number, because it has more than two factors.
What are the factors of 561?
The factors of 561 are 1, 3, 11, 17, 33, 51, 187 and 561.
How do you write 561 in Roman numerals?
561 in Roman numerals is DLXI.