109 in words
109
one hundred and nine
109 is written one hundred and nine.
Ways to write it
- As an ordinal
- one hundred and ninth
- Roman numeral
- CIX
- Expanded form
- 100 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 1 | 100 |
| tens | 0 | 0 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 109 (2 factors)
- First 10 multiples
- 109, 218, 327, 436, 545, 654, 763, 872, 981, 1,090
- Square
- 109 × 109 = 11,881
- Square root
- ≈ 10.44
- Sum of the digits
- 1 + 0 + 9 = 10
- Rounded to the nearest 10
- 110
- Rounded to the nearest 100
- 100
- Number before
- 108
- Number after
- 110
- In binary
1101101
Quick check
What number comes just after 109?
Show the answer
110
Is 109 even or odd?
Show the answer
Odd
What is 109 + 10?
Show the answer
119
Practise with a game
Times Tables Challenge
Practise any times table from 2× to 12×.
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.Frequently asked questions
How do you write 109 in words?
109 is written "one hundred and nine".
Is 109 a prime number?
Yes. 109 is a prime number: its only factors are 1 and 109.
What are the factors of 109?
The factors of 109 are 1 and 109.
How do you write 109 in Roman numerals?
109 in Roman numerals is CIX.