What is the Greatest Common Factor of 11985 and 11991?

Greatest common factor (GCF) of 11985 and 11991 is 3.

GCF(11985,11991) = 3

We will now calculate the prime factors of 11985 and 11991, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 11985 and 11991.

How to find the GCF of 11985 and 11991?

We will first find the prime factorization of 11985 and 11991. After we will calculate the factors of 11985 and 11991 and find the biggest common factor number .

Step-1: Prime Factorization of 11985

Prime factors of 11985 are 3, 5, 17, 47. Prime factorization of 11985 in exponential form is:

11985 = 3¹ × 5¹ × 17¹ × 47¹

Step-2: Prime Factorization of 11991

Prime factors of 11991 are 3, 7, 571. Prime factorization of 11991 in exponential form is:

11991 = 3¹ × 7¹ × 571¹

Step-3: Factors of 11985

List of positive integer factors of 11985 that divides 11985 without a remainder.

1, 3, 5, 15, 17, 47, 51, 85, 141, 235, 255, 705, 799, 2397, 3995

Step-4: Factors of 11991

List of positive integer factors of 11991 that divides 11985 without a remainder.

1, 3, 7, 21, 571, 1713, 3997

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 11985 and 11991. The biggest common factor number is the GCF number.
So the greatest common factor 11985 and 11991 is 3.

Also check out the Least Common Multiple of 11985 and 11991