What is the Greatest Common Factor of 1089 and 1105?

Greatest common factor (GCF) of 1089 and 1105 is 1.

GCF(1089,1105) = 1

We will now calculate the prime factors of 1089 and 1105, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1089 and 1105.

How to find the GCF of 1089 and 1105?

We will first find the prime factorization of 1089 and 1105. After we will calculate the factors of 1089 and 1105 and find the biggest common factor number .

Step-1: Prime Factorization of 1089

Prime factors of 1089 are 3, 11. Prime factorization of 1089 in exponential form is:

1089 = 3² × 11²

Step-2: Prime Factorization of 1105

Prime factors of 1105 are 5, 13, 17. Prime factorization of 1105 in exponential form is:

1105 = 5¹ × 13¹ × 17¹

Step-3: Factors of 1089

List of positive integer factors of 1089 that divides 1089 without a remainder.

1, 3, 9, 11, 33, 99, 121, 363

Step-4: Factors of 1105

List of positive integer factors of 1105 that divides 1089 without a remainder.

1, 5, 13, 17, 65, 85, 221

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1089 and 1105. The biggest common factor number is the GCF number.
So the greatest common factor 1089 and 1105 is 1.

Also check out the Least Common Multiple of 1089 and 1105