What is the Greatest Common Factor of 1691 and 1705?

Greatest common factor (GCF) of 1691 and 1705 is 1.

GCF(1691,1705) = 1

We will now calculate the prime factors of 1691 and 1705, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1691 and 1705.

How to find the GCF of 1691 and 1705?

We will first find the prime factorization of 1691 and 1705. After we will calculate the factors of 1691 and 1705 and find the biggest common factor number .

Step-1: Prime Factorization of 1691

Prime factors of 1691 are 19, 89. Prime factorization of 1691 in exponential form is:

1691 = 19¹ × 89¹

Step-2: Prime Factorization of 1705

Prime factors of 1705 are 5, 11, 31. Prime factorization of 1705 in exponential form is:

1705 = 5¹ × 11¹ × 31¹

Step-3: Factors of 1691

List of positive integer factors of 1691 that divides 1691 without a remainder.

1, 19, 89

Step-4: Factors of 1705

List of positive integer factors of 1705 that divides 1691 without a remainder.

1, 5, 11, 31, 55, 155, 341

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1691 and 1705. The biggest common factor number is the GCF number.
So the greatest common factor 1691 and 1705 is 1.

Also check out the Least Common Multiple of 1691 and 1705