What is the Greatest Common Factor of 991 and 1001?

Greatest common factor (GCF) of 991 and 1001 is 1.

GCF(991,1001) = 1

We will now calculate the prime factors of 991 and 1001, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 991 and 1001.

How to find the GCF of 991 and 1001?

We will first find the prime factorization of 991 and 1001. After we will calculate the factors of 991 and 1001 and find the biggest common factor number .

Step-1: Prime Factorization of 991

Prime factors of 991 are 991. Prime factorization of 991 in exponential form is:

991 = 991¹

Step-2: Prime Factorization of 1001

Prime factors of 1001 are 7, 11, 13. Prime factorization of 1001 in exponential form is:

1001 = 7¹ × 11¹ × 13¹

Step-3: Factors of 991

List of positive integer factors of 991 that divides 991 without a remainder.

Step-4: Factors of 1001

List of positive integer factors of 1001 that divides 991 without a remainder.

1, 7, 11, 13, 77, 91, 143

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 991 and 1001. The biggest common factor number is the GCF number.
So the greatest common factor 991 and 1001 is 1.

Also check out the Least Common Multiple of 991 and 1001