1
Number 1: Properties, Factors, and Mathematical Facts
Short answer
The number 1 is odd and neither prime nor composite. Its only positive divisor is 1.
Is 1 prime?
ClassificationNeither prime nor compositeParityOddDivisor count1AbundanceDeficient
What is the prime factorization of 1?
Prime factorization
Not defined
Learn more →What are the divisors of 1?
Divisor count
1
Divisor sum
1
Proper divisor sum
0
How is 1 classified?
Prime
Neither prime nor composite
Perfect square
YesLearn more →
Perfect cube
YesLearn more →
Fibonacci
YesLearn more →
Triangular
YesLearn more →
Power of two
Yes
How is 1 represented in other numeral systems?
Roots and powers
Square root
1 Exact
Cube root
1 Exact
Nearest lower square
1
Nearest higher square
4
Nearest lower cube
1
Nearest higher cube
8
Sequence position
Fibonacci
Index: 1
Triangular
Index: 1
Power of two
2^0
What are the digit properties of 1?
Which numbers are related to 1?
Why these results are true
- 1 is triangular because it equals 1×(1+1)/2.
Compare this number
FAQ for 1
- Is 1 prime?
- No
- What is the prime factorization of 1?
- Not defined
- Is 1 a perfect square?
- Yes
- What is 1 in binary?
- 1
- What is 1 in Roman numerals?
- I