What is the Greatest Common Factor of 1239 and 1243?

Greatest common factor (GCF) of 1239 and 1243 is 1.

GCF(1239,1243) = 1

We will now calculate the prime factors of 1239 and 1243, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1239 and 1243.

How to find the GCF of 1239 and 1243?

We will first find the prime factorization of 1239 and 1243. After we will calculate the factors of 1239 and 1243 and find the biggest common factor number .

Step-1: Prime Factorization of 1239

Prime factors of 1239 are 3, 7, 59. Prime factorization of 1239 in exponential form is:

1239 = 3¹ × 7¹ × 59¹

Step-2: Prime Factorization of 1243

Prime factors of 1243 are 11, 113. Prime factorization of 1243 in exponential form is:

1243 = 11¹ × 113¹

Step-3: Factors of 1239

List of positive integer factors of 1239 that divides 1239 without a remainder.

1, 3, 7, 21, 59, 177, 413

Step-4: Factors of 1243

List of positive integer factors of 1243 that divides 1239 without a remainder.

1, 11, 113

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1239 and 1243. The biggest common factor number is the GCF number.
So the greatest common factor 1239 and 1243 is 1.

Also check out the Least Common Multiple of 1239 and 1243