What is the Greatest Common Factor of 12981 and 12987?

Greatest common factor (GCF) of 12981 and 12987 is 3.

GCF(12981,12987) = 3

We will now calculate the prime factors of 12981 and 12987, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 12981 and 12987.

How to find the GCF of 12981 and 12987?

We will first find the prime factorization of 12981 and 12987. After we will calculate the factors of 12981 and 12987 and find the biggest common factor number .

Step-1: Prime Factorization of 12981

Prime factors of 12981 are 3, 4327. Prime factorization of 12981 in exponential form is:

12981 = 3¹ × 4327¹

Step-2: Prime Factorization of 12987

Prime factors of 12987 are 3, 13, 37. Prime factorization of 12987 in exponential form is:

12987 = 3³ × 13¹ × 37¹

Step-3: Factors of 12981

List of positive integer factors of 12981 that divides 12981 without a remainder.

1, 3, 4327

Step-4: Factors of 12987

List of positive integer factors of 12987 that divides 12981 without a remainder.

1, 3, 9, 13, 27, 37, 39, 111, 117, 333, 351, 481, 999, 1443, 4329

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 12981 and 12987. The biggest common factor number is the GCF number.
So the greatest common factor 12981 and 12987 is 3.

Also check out the Least Common Multiple of 12981 and 12987