What is the Greatest Common Factor of 12285 and 12291?

Greatest common factor (GCF) of 12285 and 12291 is 3.

GCF(12285,12291) = 3

We will now calculate the prime factors of 12285 and 12291, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 12285 and 12291.

How to find the GCF of 12285 and 12291?

We will first find the prime factorization of 12285 and 12291. After we will calculate the factors of 12285 and 12291 and find the biggest common factor number .

Step-1: Prime Factorization of 12285

Prime factors of 12285 are 3, 5, 7, 13. Prime factorization of 12285 in exponential form is:

12285 = 3³ × 5¹ × 7¹ × 13¹

Step-2: Prime Factorization of 12291

Prime factors of 12291 are 3, 17, 241. Prime factorization of 12291 in exponential form is:

12291 = 3¹ × 17¹ × 241¹

Step-3: Factors of 12285

List of positive integer factors of 12285 that divides 12285 without a remainder.

1, 3, 5, 7, 9, 13, 15, 21, 27, 35, 39, 45, 63, 65, 91, 105, 117, 135, 189, 195, 273, 315, 351, 455, 585, 819, 945, 1365, 1755, 2457, 4095

Step-4: Factors of 12291

List of positive integer factors of 12291 that divides 12285 without a remainder.

1, 3, 17, 51, 241, 723, 4097

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 12285 and 12291. The biggest common factor number is the GCF number.
So the greatest common factor 12285 and 12291 is 3.

Also check out the Least Common Multiple of 12285 and 12291