What is the Greatest Common Factor of 15985 and 15991?

Greatest common factor (GCF) of 15985 and 15991 is 1.

GCF(15985,15991) = 1

We will now calculate the prime factors of 15985 and 15991, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15985 and 15991.

How to find the GCF of 15985 and 15991?

We will first find the prime factorization of 15985 and 15991. After we will calculate the factors of 15985 and 15991 and find the biggest common factor number .

Step-1: Prime Factorization of 15985

Prime factors of 15985 are 5, 23, 139. Prime factorization of 15985 in exponential form is:

15985 = 5¹ × 23¹ × 139¹

Step-2: Prime Factorization of 15991

Prime factors of 15991 are 15991. Prime factorization of 15991 in exponential form is:

15991 = 15991¹

Step-3: Factors of 15985

List of positive integer factors of 15985 that divides 15985 without a remainder.

1, 5, 23, 115, 139, 695, 3197

Step-4: Factors of 15991

List of positive integer factors of 15991 that divides 15985 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15985 and 15991. The biggest common factor number is the GCF number.
So the greatest common factor 15985 and 15991 is 1.

Also check out the Least Common Multiple of 15985 and 15991