What is the Greatest Common Factor of 1581 and 1585?

Greatest common factor (GCF) of 1581 and 1585 is 1.

GCF(1581,1585) = 1

We will now calculate the prime factors of 1581 and 1585, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1581 and 1585.

How to find the GCF of 1581 and 1585?

We will first find the prime factorization of 1581 and 1585. After we will calculate the factors of 1581 and 1585 and find the biggest common factor number .

Step-1: Prime Factorization of 1581

Prime factors of 1581 are 3, 17, 31. Prime factorization of 1581 in exponential form is:

1581 = 3¹ × 17¹ × 31¹

Step-2: Prime Factorization of 1585

Prime factors of 1585 are 5, 317. Prime factorization of 1585 in exponential form is:

1585 = 5¹ × 317¹

Step-3: Factors of 1581

List of positive integer factors of 1581 that divides 1581 without a remainder.

1, 3, 17, 31, 51, 93, 527

Step-4: Factors of 1585

List of positive integer factors of 1585 that divides 1581 without a remainder.

1, 5, 317

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1581 and 1585. The biggest common factor number is the GCF number.
So the greatest common factor 1581 and 1585 is 1.

Also check out the Least Common Multiple of 1581 and 1585