What is the Greatest Common Factor of 1503 and 1521?

Greatest common factor (GCF) of 1503 and 1521 is 9.

GCF(1503,1521) = 9

We will now calculate the prime factors of 1503 and 1521, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1503 and 1521.

How to find the GCF of 1503 and 1521?

We will first find the prime factorization of 1503 and 1521. After we will calculate the factors of 1503 and 1521 and find the biggest common factor number .

Step-1: Prime Factorization of 1503

Prime factors of 1503 are 3, 167. Prime factorization of 1503 in exponential form is:

1503 = 3² × 167¹

Step-2: Prime Factorization of 1521

Prime factors of 1521 are 3, 13. Prime factorization of 1521 in exponential form is:

1521 = 3² × 13²

Step-3: Factors of 1503

List of positive integer factors of 1503 that divides 1503 without a remainder.

1, 3, 9, 167, 501

Step-4: Factors of 1521

List of positive integer factors of 1521 that divides 1503 without a remainder.

1, 3, 9, 13, 39, 117, 169, 507

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1503 and 1521. The biggest common factor number is the GCF number.
So the greatest common factor 1503 and 1521 is 9.

Also check out the Least Common Multiple of 1503 and 1521