What is the Greatest Common Factor of 1257 and 1261?

Greatest common factor (GCF) of 1257 and 1261 is 1.

GCF(1257,1261) = 1

We will now calculate the prime factors of 1257 and 1261, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1257 and 1261.

How to find the GCF of 1257 and 1261?

We will first find the prime factorization of 1257 and 1261. After we will calculate the factors of 1257 and 1261 and find the biggest common factor number .

Step-1: Prime Factorization of 1257

Prime factors of 1257 are 3, 419. Prime factorization of 1257 in exponential form is:

1257 = 3¹ × 419¹

Step-2: Prime Factorization of 1261

Prime factors of 1261 are 13, 97. Prime factorization of 1261 in exponential form is:

1261 = 13¹ × 97¹

Step-3: Factors of 1257

List of positive integer factors of 1257 that divides 1257 without a remainder.

1, 3, 419

Step-4: Factors of 1261

List of positive integer factors of 1261 that divides 1257 without a remainder.

1, 13, 97

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1257 and 1261. The biggest common factor number is the GCF number.
So the greatest common factor 1257 and 1261 is 1.

Also check out the Least Common Multiple of 1257 and 1261