What is the Greatest Common Factor of 1983 and 1991?

Greatest common factor (GCF) of 1983 and 1991 is 1.

GCF(1983,1991) = 1

We will now calculate the prime factors of 1983 and 1991, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1983 and 1991.

How to find the GCF of 1983 and 1991?

We will first find the prime factorization of 1983 and 1991. After we will calculate the factors of 1983 and 1991 and find the biggest common factor number .

Step-1: Prime Factorization of 1983

Prime factors of 1983 are 3, 661. Prime factorization of 1983 in exponential form is:

1983 = 3¹ × 661¹

Step-2: Prime Factorization of 1991

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

1991 = 11¹ × 181¹

Step-3: Factors of 1983

List of positive integer factors of 1983 that divides 1983 without a remainder.

1, 3, 661

Step-4: Factors of 1991

List of positive integer factors of 1991 that divides 1983 without a remainder.

1, 11, 181

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1983 and 1991. The biggest common factor number is the GCF number.
So the greatest common factor 1983 and 1991 is 1.

Also check out the Least Common Multiple of 1983 and 1991