1

is an integer between and.

1 is an odd number and a deficient number.

1 is a power of 2 and a power of 10, and is the only number to be the power of every number except 0. This is because n0 = 1, where n ≠ 0, by definition.

Primality of 1
One is neither a prime number or a composite number.

1 is not prime as it has only 1 factor: 1 itself. All prime numbers have factors: 1 and itself, making it have 2 factors.

Even though it fits the definition of a prime above, it has only one factor, so it is not a prime.

Unfortunately, it is not a composite number. A composite number has 3 factors or more, so 1 is not a composite number.

Therefore, 1 is neither.