What is the Greatest Common Factor of 855 and 871?

Greatest common factor (GCF) of 855 and 871 is 1.

GCF(855,871) = 1

We will now calculate the prime factors of 855 and 871, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 855 and 871.

How to find the GCF of 855 and 871?

We will first find the prime factorization of 855 and 871. After we will calculate the factors of 855 and 871 and find the biggest common factor number .

Step-1: Prime Factorization of 855

Prime factors of 855 are 3, 5, 19. Prime factorization of 855 in exponential form is:

855 = 3² × 5¹ × 19¹

Step-2: Prime Factorization of 871

Prime factors of 871 are 13, 67. Prime factorization of 871 in exponential form is:

871 = 13¹ × 67¹

Step-3: Factors of 855

List of positive integer factors of 855 that divides 855 without a remainder.

1, 3, 5, 9, 15, 19, 45, 57, 95, 171, 285

Step-4: Factors of 871

List of positive integer factors of 871 that divides 855 without a remainder.

1, 13, 67

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 855 and 871. The biggest common factor number is the GCF number.
So the greatest common factor 855 and 871 is 1.

Also check out the Least Common Multiple of 855 and 871