The number one.
The least factor of any number is 1.
For positive integers, 1 is.
The least common factor is: 1
None. The least common factor is defined only for two or more numbers: one number cannot have a LCF. In any case, the least factor of any number is 1. So 91 cannot be a least common factor of any number since 1 is a factor and 1 is less than 91.
Any even number has at least one even factor.
1 is the least common factor of the number 2, number 4 and number 7. 28 is the least common multiple of the number 2, number 4 and 7.
The least common factor of any set of numbers is 1.
The least common factor of any number or set of numbers is 1.
Every number has 1 as its factor and 1 is the smallest factor of any number. So least common factor of two or more numbers is always 1. Therefore, least common factor of 23 and 25 is 1.
One has one factor.
1 has one factor.
The number one.