1
Number 1 properties
- Perfect square
- Fibonacci
- Happy
- Palindrome
- Harshad
- Armstrong
- Automorphic
- Triangular
- 1 is an odd number.
- 1 is a palindrome.
- 1 is a perfect square (1 × 1).
- 1 is a perfect cube (1 × 1 × 1).
- 1 is triangular and equals T1.
- 1 is an Armstrong (or Narcissistic) number, which means it is the sum of its own digits each raised to the power of the number of digits.
- 1 is Fibonacci number #1.
- 1 is a Harshad number, which means it is divisible by the sum of its digits (1 = 1, and 1 is divisible by 1).
- 1 is the factorial number of 1 (1! = 1).
Prime factorization
Prime factorization of 1: 1 has no prime factors.
Divisors
Divisor count: 1
1
Factors of 1 are: 1.
Representations
In octal, 1 is represented as 1.
In binary, 1 is represented as 1.
In hex, 1 is represented as 1.
Roman numeral: I
Curiosities
- 1 is the only number that is neither prime nor composite.
Related numbers
Nearby primes: 2, 3, 5
Quick answers
Is 1 prime?
No, 1 is not prime.
What are the factors of 1?
1
What is 1 in binary?
1