What is the greatest common factor of 131 and 161?

A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common.

One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.

The factors of 131 are 1 and 131.

The factors of 161 are 1, 7, 23, and 161.

The only common factor is 1. Therefore, the greatest common factor is 1.