What is the Greatest Common Factor of 1131 and 1140?

Greatest common factor (GCF) of 1131 and 1140 is 3.

GCF(1131,1140) = 3

We will now calculate the prime factors of 1131 and 1140, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1131 and 1140.

How to find the GCF of 1131 and 1140?

We will first find the prime factorization of 1131 and 1140. After we will calculate the factors of 1131 and 1140 and find the biggest common factor number .

Step-1: Prime Factorization of 1131

Prime factors of 1131 are 3, 13, 29. Prime factorization of 1131 in exponential form is:

1131 = 3¹ × 13¹ × 29¹

Step-2: Prime Factorization of 1140

Prime factors of 1140 are 2, 3, 5, 19. Prime factorization of 1140 in exponential form is:

1140 = 2² × 3¹ × 5¹ × 19¹

Step-3: Factors of 1131

List of positive integer factors of 1131 that divides 1131 without a remainder.

1, 3, 13, 29, 39, 87, 377

Step-4: Factors of 1140

List of positive integer factors of 1140 that divides 1131 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 19, 20, 30, 38, 57, 60, 76, 95, 114, 190, 228, 285, 380, 570

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1131 and 1140. The biggest common factor number is the GCF number.
So the greatest common factor 1131 and 1140 is 3.

Also check out the Least Common Multiple of 1131 and 1140