What is the Greatest Common Factor of 1971 and 1978?

Greatest common factor (GCF) of 1971 and 1978 is 1.

GCF(1971,1978) = 1

We will now calculate the prime factors of 1971 and 1978, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1971 and 1978.

How to find the GCF of 1971 and 1978?

We will first find the prime factorization of 1971 and 1978. After we will calculate the factors of 1971 and 1978 and find the biggest common factor number .

Step-1: Prime Factorization of 1971

Prime factors of 1971 are 3, 73. Prime factorization of 1971 in exponential form is:

1971 = 3³ × 73¹

Step-2: Prime Factorization of 1978

Prime factors of 1978 are 2, 23, 43. Prime factorization of 1978 in exponential form is:

1978 = 2¹ × 23¹ × 43¹

Step-3: Factors of 1971

List of positive integer factors of 1971 that divides 1971 without a remainder.

1, 3, 9, 27, 73, 219, 657

Step-4: Factors of 1978

List of positive integer factors of 1978 that divides 1971 without a remainder.

1, 2, 23, 43, 46, 86, 989

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1971 and 1978. The biggest common factor number is the GCF number.
So the greatest common factor 1971 and 1978 is 1.

Also check out the Least Common Multiple of 1971 and 1978