What is the Greatest Common Factor of 209 and 217?

Greatest common factor (GCF) of 209 and 217 is 1.

GCF(209,217) = 1

We will now calculate the prime factors of 209 and 217, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 209 and 217.

How to find the GCF of 209 and 217?

We will first find the prime factorization of 209 and 217. After we will calculate the factors of 209 and 217 and find the biggest common factor number .

Step-1: Prime Factorization of 209

Prime factors of 209 are 11, 19. Prime factorization of 209 in exponential form is:

209 = 11¹ × 19¹

Step-2: Prime Factorization of 217

Prime factors of 217 are 7, 31. Prime factorization of 217 in exponential form is:

217 = 7¹ × 31¹

Step-3: Factors of 209

List of positive integer factors of 209 that divides 209 without a remainder.

1, 11, 19

Step-4: Factors of 217

List of positive integer factors of 217 that divides 209 without a remainder.

1, 7, 31

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 209 and 217. The biggest common factor number is the GCF number.
So the greatest common factor 209 and 217 is 1.

Also check out the Least Common Multiple of 209 and 217