What is the Greatest Common Factor of 15975 and 15981?

Greatest common factor (GCF) of 15975 and 15981 is 3.

GCF(15975,15981) = 3

We will now calculate the prime factors of 15975 and 15981, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15975 and 15981.

How to find the GCF of 15975 and 15981?

We will first find the prime factorization of 15975 and 15981. After we will calculate the factors of 15975 and 15981 and find the biggest common factor number .

Step-1: Prime Factorization of 15975

Prime factors of 15975 are 3, 5, 71. Prime factorization of 15975 in exponential form is:

15975 = 3² × 5² × 71¹

Step-2: 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-3: Factors of 15975

List of positive integer factors of 15975 that divides 15975 without a remainder.

1, 3, 5, 9, 15, 25, 45, 71, 75, 213, 225, 355, 639, 1065, 1775, 3195, 5325

Step-4: Factors of 15981

List of positive integer factors of 15981 that divides 15975 without a remainder.

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

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15975 and 15981. The biggest common factor number is the GCF number.
So the greatest common factor 15975 and 15981 is 3.

Also check out the Least Common Multiple of 15975 and 15981