What is the Greatest Common Factor of 61981 and 61985?

Greatest common factor (GCF) of 61981 and 61985 is 1.

GCF(61981,61985) = 1

We will now calculate the prime factors of 61981 and 61985, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 61981 and 61985.

How to find the GCF of 61981 and 61985?

We will first find the prime factorization of 61981 and 61985. After we will calculate the factors of 61981 and 61985 and find the biggest common factor number .

Step-1: Prime Factorization of 61981

Prime factors of 61981 are 61981. Prime factorization of 61981 in exponential form is:

61981 = 61981¹

Step-2: Prime Factorization of 61985

Prime factors of 61985 are 5, 7, 11, 23. Prime factorization of 61985 in exponential form is:

61985 = 5¹ × 7² × 11¹ × 23¹

Step-3: Factors of 61981

List of positive integer factors of 61981 that divides 61981 without a remainder.

Step-4: Factors of 61985

List of positive integer factors of 61985 that divides 61981 without a remainder.

1, 5, 7, 11, 23, 35, 49, 55, 77, 115, 161, 245, 253, 385, 539, 805, 1127, 1265, 1771, 2695, 5635, 8855, 12397

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 61981 and 61985. The biggest common factor number is the GCF number.
So the greatest common factor 61981 and 61985 is 1.

Also check out the Least Common Multiple of 61981 and 61985