101 in words
101
one hundred one
101 is written one hundred one.
Ways to write it
- As an ordinal
- one hundred first
- Roman numeral
- CI
- Expanded form
- 100 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 1 | 100 |
| tens | 0 | 0 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 101 (2 factors)
- First 10 multiples
- 101, 202, 303, 404, 505, 606, 707, 808, 909, 1,010
- Square
- 101 × 101 = 10,201
- Square root
- ≈ 10.05
- Sum of the digits
- 1 + 0 + 1 = 2
- Rounded to the nearest 10
- 100
- Rounded to the nearest 100
- 100
- Number before
- 100
- Number after
- 102
- In binary
1100101
Quick check
What number comes just after 101?
Show the answer
102
Is 101 even or odd?
Show the answer
Odd
What is 101 + 10?
Show the answer
111
Practice with a game
Times Tables Challenge
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Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.Frequently asked questions
How do you write 101 in words?
101 is written "one hundred one".
Is 101 a prime number?
Yes. 101 is a prime number: its only factors are 1 and 101.
What are the factors of 101?
The factors of 101 are 1 and 101.
How do you write 101 in Roman numerals?
101 in Roman numerals is CI.