171 in words
171
one hundred and seventy-one
171 is written one hundred and seventy-one.
Ways to write it
- As an ordinal
- one hundred and seventy-first
- Roman numeral
- CLXXI
- Expanded form
- 100 + 70 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 1 | 100 |
| tens | 7 | 70 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 9, 19, 57 and 171 (6 factors)
- First 10 multiples
- 171, 342, 513, 684, 855, 1,026, 1,197, 1,368, 1,539, 1,710
- Square
- 171 × 171 = 29,241
- Square root
- ≈ 13.08
- Sum of the digits
- 1 + 7 + 1 = 9
- Rounded to the nearest 10
- 170
- Rounded to the nearest 100
- 200
- Number before
- 170
- Number after
- 172
- In binary
10101011
Quick check
What number comes just after 171?
Show the answer
172
Is 171 even or odd?
Show the answer
Odd
What is 171 + 10?
Show the answer
181
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 171 in words?
171 is written "one hundred and seventy-one".
Is 171 a prime number?
No. 171 is a composite number, because it has more than two factors.
What are the factors of 171?
The factors of 171 are 1, 3, 9, 19, 57 and 171.
How do you write 171 in Roman numerals?
171 in Roman numerals is CLXXI.