What is the Greatest Common Factor of 12543 and 12561?

Greatest common factor (GCF) of 12543 and 12561 is 3.

GCF(12543,12561) = 3

We will now calculate the prime factors of 12543 and 12561, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 12543 and 12561.

How to find the GCF of 12543 and 12561?

We will first find the prime factorization of 12543 and 12561. After we will calculate the factors of 12543 and 12561 and find the biggest common factor number .

Step-1: Prime Factorization of 12543

Prime factors of 12543 are 3, 37, 113. Prime factorization of 12543 in exponential form is:

12543 = 3¹ × 37¹ × 113¹

Step-2: Prime Factorization of 12561

Prime factors of 12561 are 3, 53, 79. Prime factorization of 12561 in exponential form is:

12561 = 3¹ × 53¹ × 79¹

Step-3: Factors of 12543

List of positive integer factors of 12543 that divides 12543 without a remainder.

1, 3, 37, 111, 113, 339, 4181

Step-4: Factors of 12561

List of positive integer factors of 12561 that divides 12543 without a remainder.

1, 3, 53, 79, 159, 237, 4187

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 12543 and 12561. The biggest common factor number is the GCF number.
So the greatest common factor 12543 and 12561 is 3.

Also check out the Least Common Multiple of 12543 and 12561