1,001 in words
1,001
one thousand and one
1,001 is written one thousand and one.
Ways to write it
- As an ordinal
- one thousand and first
- Roman numeral
- MI
- Expanded form
- 1,000 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 0 | 0 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 7, 11, 13, 77, 91, 143 and 1,001 (8 factors)
- First 10 multiples
- 1,001, 2,002, 3,003, 4,004, 5,005, 6,006, 7,007, 8,008, 9,009, 10,010
- Square
- 1,001 × 1,001 = 1,002,001
- Square root
- ≈ 31.64
- Sum of the digits
- 1 + 0 + 0 + 1 = 2
- Rounded to the nearest 10
- 1,000
- Rounded to the nearest 100
- 1,000
- Rounded to the nearest 1000
- 1,000
- Number before
- 1,000
- Number after
- 1,002
- In binary
1111101001
Quick check
What number comes just after 1,001?
Show the answer
1,002
Is 1,001 even or odd?
Show the answer
Odd
What is 1,001 + 10?
Show the answer
1,011
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 1,001 in words?
1,001 is written "one thousand and one".
Is 1,001 a prime number?
No. 1,001 is a composite number, because it has more than two factors.
What are the factors of 1,001?
The factors of 1,001 are 1, 7, 11, 13, 77, 91, 143 and 1,001.
How do you write 1,001 in Roman numerals?
1,001 in Roman numerals is MI.