What is the Greatest Common Factor of 1981 and 2001?

Greatest common factor (GCF) of 1981 and 2001 is 1.

GCF(1981,2001) = 1

We will now calculate the prime factors of 1981 and 2001, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1981 and 2001.

How to find the GCF of 1981 and 2001?

We will first find the prime factorization of 1981 and 2001. After we will calculate the factors of 1981 and 2001 and find the biggest common factor number .

Step-1: Prime Factorization of 1981

Prime factors of 1981 are 7, 283. Prime factorization of 1981 in exponential form is:

1981 = 7¹ × 283¹

Step-2: Prime Factorization of 2001

Prime factors of 2001 are 3, 23, 29. Prime factorization of 2001 in exponential form is:

2001 = 3¹ × 23¹ × 29¹

Step-3: Factors of 1981

List of positive integer factors of 1981 that divides 1981 without a remainder.

1, 7, 283

Step-4: Factors of 2001

List of positive integer factors of 2001 that divides 1981 without a remainder.

1, 3, 23, 29, 69, 87, 667

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1981 and 2001. The biggest common factor number is the GCF number.
So the greatest common factor 1981 and 2001 is 1.

Also check out the Least Common Multiple of 1981 and 2001