What is the Greatest Common Factor of 1197 and 1215?

Greatest common factor (GCF) of 1197 and 1215 is 9.

GCF(1197,1215) = 9

We will now calculate the prime factors of 1197 and 1215, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1197 and 1215.

How to find the GCF of 1197 and 1215?

We will first find the prime factorization of 1197 and 1215. After we will calculate the factors of 1197 and 1215 and find the biggest common factor number .

Step-1: Prime Factorization of 1197

Prime factors of 1197 are 3, 7, 19. Prime factorization of 1197 in exponential form is:

1197 = 3² × 7¹ × 19¹

Step-2: Prime Factorization of 1215

Prime factors of 1215 are 3, 5. Prime factorization of 1215 in exponential form is:

1215 = 3⁵ × 5¹

Step-3: Factors of 1197

List of positive integer factors of 1197 that divides 1197 without a remainder.

1, 3, 7, 9, 19, 21, 57, 63, 133, 171, 399

Step-4: Factors of 1215

List of positive integer factors of 1215 that divides 1197 without a remainder.

1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1197 and 1215. The biggest common factor number is the GCF number.
So the greatest common factor 1197 and 1215 is 9.

Also check out the Least Common Multiple of 1197 and 1215