What is the Greatest Common Factor of 391 and 409?

Greatest common factor (GCF) of 391 and 409 is 1.

GCF(391,409) = 1

We will now calculate the prime factors of 391 and 409, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 391 and 409.

How to find the GCF of 391 and 409?

We will first find the prime factorization of 391 and 409. After we will calculate the factors of 391 and 409 and find the biggest common factor number .

Step-1: Prime Factorization of 391

Prime factors of 391 are 17, 23. Prime factorization of 391 in exponential form is:

391 = 17¹ × 23¹

Step-2: Prime Factorization of 409

Prime factors of 409 are 409. Prime factorization of 409 in exponential form is:

409 = 409¹

Step-3: Factors of 391

List of positive integer factors of 391 that divides 391 without a remainder.

1, 17, 23

Step-4: Factors of 409

List of positive integer factors of 409 that divides 391 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 391 and 409. The biggest common factor number is the GCF number.
So the greatest common factor 391 and 409 is 1.

Also check out the Least Common Multiple of 391 and 409