The number ' 1 ' has only one factor.
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A divisor.
The least common divisor is always the number "1."
1 is a factor of any number.
1 and 19. It is a prime number.
The accepted definition of a prime number is a natural number which has exactly two distinct divisors. The number 1 has only one distinct divisor: itself. The number 0 can be said to have infinitely many distinct divisors.