What is the Greatest Common Factor of 171 and 186?

Greatest common factor (GCF) of 171 and 186 is 3.

GCF(171,186) = 3

We will now calculate the prime factors of 171 and 186, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 171 and 186.

How to find the GCF of 171 and 186?

We will first find the prime factorization of 171 and 186. After we will calculate the factors of 171 and 186 and find the biggest common factor number .

Step-1: Prime Factorization of 171

Prime factors of 171 are 3, 19. Prime factorization of 171 in exponential form is:

171 = 3² × 19¹

Step-2: Prime Factorization of 186

Prime factors of 186 are 2, 3, 31. Prime factorization of 186 in exponential form is:

186 = 2¹ × 3¹ × 31¹

Step-3: Factors of 171

List of positive integer factors of 171 that divides 171 without a remainder.

1, 3, 9, 19, 57

Step-4: Factors of 186

List of positive integer factors of 186 that divides 171 without a remainder.

1, 2, 3, 6, 31, 62, 93

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 171 and 186. The biggest common factor number is the GCF number.
So the greatest common factor 171 and 186 is 3.

Also check out the Least Common Multiple of 171 and 186