What is the Greatest Common Factor of 819 and 831?

Greatest common factor (GCF) of 819 and 831 is 3.

GCF(819,831) = 3

We will now calculate the prime factors of 819 and 831, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 819 and 831.

How to find the GCF of 819 and 831?

We will first find the prime factorization of 819 and 831. After we will calculate the factors of 819 and 831 and find the biggest common factor number .

Step-1: Prime Factorization of 819

Prime factors of 819 are 3, 7, 13. Prime factorization of 819 in exponential form is:

819 = 3² × 7¹ × 13¹

Step-2: Prime Factorization of 831

Prime factors of 831 are 3, 277. Prime factorization of 831 in exponential form is:

831 = 3¹ × 277¹

Step-3: Factors of 819

List of positive integer factors of 819 that divides 819 without a remainder.

1, 3, 7, 9, 13, 21, 39, 63, 91, 117, 273

Step-4: Factors of 831

List of positive integer factors of 831 that divides 819 without a remainder.

1, 3, 277

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 819 and 831. The biggest common factor number is the GCF number.
So the greatest common factor 819 and 831 is 3.

Also check out the Least Common Multiple of 819 and 831