What is the Greatest Common Factor of 1285 and 1292?

Greatest common factor (GCF) of 1285 and 1292 is 1.

GCF(1285,1292) = 1

We will now calculate the prime factors of 1285 and 1292, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1285 and 1292.

How to find the GCF of 1285 and 1292?

We will first find the prime factorization of 1285 and 1292. After we will calculate the factors of 1285 and 1292 and find the biggest common factor number .

Step-1: Prime Factorization of 1285

Prime factors of 1285 are 5, 257. Prime factorization of 1285 in exponential form is:

1285 = 5¹ × 257¹

Step-2: Prime Factorization of 1292

Prime factors of 1292 are 2, 17, 19. Prime factorization of 1292 in exponential form is:

1292 = 2² × 17¹ × 19¹

Step-3: Factors of 1285

List of positive integer factors of 1285 that divides 1285 without a remainder.

1, 5, 257

Step-4: Factors of 1292

List of positive integer factors of 1292 that divides 1285 without a remainder.

1, 2, 4, 17, 19, 34, 38, 68, 76, 323, 646

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1285 and 1292. The biggest common factor number is the GCF number.
So the greatest common factor 1285 and 1292 is 1.

Also check out the Least Common Multiple of 1285 and 1292