What is the Greatest Common Factor of 261 and 273?

Greatest common factor (GCF) of 261 and 273 is 3.

GCF(261,273) = 3

We will now calculate the prime factors of 261 and 273, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 261 and 273.

How to find the GCF of 261 and 273?

We will first find the prime factorization of 261 and 273. After we will calculate the factors of 261 and 273 and find the biggest common factor number .

Step-1: Prime Factorization of 261

Prime factors of 261 are 3, 29. Prime factorization of 261 in exponential form is:

261 = 3² × 29¹

Step-2: Prime Factorization of 273

Prime factors of 273 are 3, 7, 13. Prime factorization of 273 in exponential form is:

273 = 3¹ × 7¹ × 13¹

Step-3: Factors of 261

List of positive integer factors of 261 that divides 261 without a remainder.

1, 3, 9, 29, 87

Step-4: Factors of 273

List of positive integer factors of 273 that divides 261 without a remainder.

1, 3, 7, 13, 21, 39, 91

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 261 and 273. The biggest common factor number is the GCF number.
So the greatest common factor 261 and 273 is 3.

Also check out the Least Common Multiple of 261 and 273