551 in words
551
five hundred fifty-one
551 is written five hundred fifty-one.
Ways to write it
- As an ordinal
- five hundred fifty-first
- Roman numeral
- DLI
- Expanded form
- 500 + 50 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 5 | 500 |
| tens | 5 | 50 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 19, 29 and 551 (4 factors)
- First 10 multiples
- 551, 1,102, 1,653, 2,204, 2,755, 3,306, 3,857, 4,408, 4,959, 5,510
- Square
- 551 × 551 = 303,601
- Square root
- ≈ 23.47
- Sum of the digits
- 5 + 5 + 1 = 11
- Rounded to the nearest 10
- 550
- Rounded to the nearest 100
- 600
- Number before
- 550
- Number after
- 552
- In binary
1000100111
Quick check
What number comes just after 551?
Show the answer
552
Is 551 even or odd?
Show the answer
Odd
What is 551 + 10?
Show the answer
561
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 551 in words?
551 is written "five hundred fifty-one".
Is 551 a prime number?
No. 551 is a composite number, because it has more than two factors.
What are the factors of 551?
The factors of 551 are 1, 19, 29 and 551.
How do you write 551 in Roman numerals?
551 in Roman numerals is DLI.