What is the Greatest Common Factor of 91 and 109?

Greatest common factor (GCF) of 91 and 109 is 1.

GCF(91,109) = 1

We will now calculate the prime factors of 91 and 109, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 91 and 109.

How to find the GCF of 91 and 109?

We will first find the prime factorization of 91 and 109. After we will calculate the factors of 91 and 109 and find the biggest common factor number .

Step-1: Prime Factorization of 91

Prime factors of 91 are 7, 13. Prime factorization of 91 in exponential form is:

91 = 7¹ × 13¹

Step-2: Prime Factorization of 109

Prime factors of 109 are 109. Prime factorization of 109 in exponential form is:

109 = 109¹

Step-3: Factors of 91

List of positive integer factors of 91 that divides 91 without a remainder.

1, 7, 13

Step-4: Factors of 109

List of positive integer factors of 109 that divides 91 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 91 and 109. The biggest common factor number is the GCF number.
So the greatest common factor 91 and 109 is 1.

Also check out the Least Common Multiple of 91 and 109