What is the Greatest Common Factor of 1991 and 2008?

Greatest common factor (GCF) of 1991 and 2008 is 1.

GCF(1991,2008) = 1

We will now calculate the prime factors of 1991 and 2008, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1991 and 2008.

How to find the GCF of 1991 and 2008?

We will first find the prime factorization of 1991 and 2008. After we will calculate the factors of 1991 and 2008 and find the biggest common factor number .

Step-1: Prime Factorization of 1991

Prime factors of 1991 are 11, 181. Prime factorization of 1991 in exponential form is:

1991 = 11¹ × 181¹

Step-2: Prime Factorization of 2008

Prime factors of 2008 are 2, 251. Prime factorization of 2008 in exponential form is:

2008 = 2³ × 251¹

Step-3: Factors of 1991

List of positive integer factors of 1991 that divides 1991 without a remainder.

1, 11, 181

Step-4: Factors of 2008

List of positive integer factors of 2008 that divides 1991 without a remainder.

1, 2, 4, 8, 251, 502, 1004

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1991 and 2008. The biggest common factor number is the GCF number.
So the greatest common factor 1991 and 2008 is 1.

Also check out the Least Common Multiple of 1991 and 2008