What is the Greatest Common Factor of 15981 and 15987?

Greatest common factor (GCF) of 15981 and 15987 is 3.

GCF(15981,15987) = 3

We will now calculate the prime factors of 15981 and 15987, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15981 and 15987.

How to find the GCF of 15981 and 15987?

We will first find the prime factorization of 15981 and 15987. After we will calculate the factors of 15981 and 15987 and find the biggest common factor number .

Step-1: Prime Factorization of 15981

Prime factors of 15981 are 3, 7, 761. Prime factorization of 15981 in exponential form is:

15981 = 3¹ × 7¹ × 761¹

Step-2: Prime Factorization of 15987

Prime factors of 15987 are 3, 73. Prime factorization of 15987 in exponential form is:

15987 = 3¹ × 73²

Step-3: Factors of 15981

List of positive integer factors of 15981 that divides 15981 without a remainder.

1, 3, 7, 21, 761, 2283, 5327

Step-4: Factors of 15987

List of positive integer factors of 15987 that divides 15981 without a remainder.

1, 3, 73, 219, 5329

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15981 and 15987. The biggest common factor number is the GCF number.
So the greatest common factor 15981 and 15987 is 3.

Also check out the Least Common Multiple of 15981 and 15987