Greatest Common Factor of 1561 and 1565

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

Make use of GCF Calculator to quickly find the Greatest Common Factor of numbers 1561, 1565 i.e. 1 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 1561 and 1565 is 1.

GCF(1561,1565) = 1

GCF of 1561 and 1565

Greatest common factor or Greatest common divisor (GCD) can be calculated in following way;

GCF of:
and

Greatest Common Factor of 1561 and 1565

GCF of 1561 and 1565 is 1

Prime Factorization of 1561


7 1561
223 223
1

Prime factors of 1561 are 7,223. Prime factorization of 1561 in exponential form is:

1561 = 71×2231

Prime Factorization of 1565


5 1565
313 313
1

Prime factors of 1565 are 5,313. Prime factorization of 1565 in exponential form is:

1565 = 51×3131

∴ So by taking common prime factors GCF of 1561 and 1565 is 1

Greatest Common Factor of 1561 and 1565 by matching factors method

Factors of 1561

List of positive integer factors of 1561 that divides 1561 without a remainder.

1,7,223,1561

Factors of 1565

List of positive integer factors of 1565 that divides 1565 without a remainder.

1,5,313,1565

Greatest Common Factor

We found the factors and prime factorization of 1561 and 1565. The biggest common factor number is the GCF number.
So the greatest common factor 1561 and 1565 is 1.

Also check out the Least Common Multiple of 1561 and 1565

Properties of GCF 1561 and 1565

(i) The GCF of 1561 and 1565 is associative

GCF of 1561 and 1565 = GCF of 1565 and 1561

Related Greatest Common Factor of 1561

Related Greatest Common Factor of 1565

Frequently Asked Questions on GCF of 1561 and 1565

1. What is the GCF of 1561 and 1565?

Answer: GCF of 1561 and 1565 is 1.

2. What are the Factors of 1561?

Answer: Factors of 1561 are 1, 7, 223, 1561. There are 4 integers that are factors of 1561. The greatest factor of 1561 is 1561.

3. What are the Factors of 1565?

Answer: Factors of 1565 are 1, 5, 313, 1565. There are 4 integers that are factors of 1565. The greatest factor of 1565 is 1565.

4. How to Find the GCF of 1561 and 1565?

Answer:

Greatest Common Factor of 1561 and 1565 = 1

Step 1: Find the prime factorization of 1561

1561 = 7 x 223

Step 2: Find the prime factorization of 1565

1565 = 5 x 313

Step 3: Multiply those factors both numbers have in common in steps i) or ii) above to find the gcf:

GCF = = 1

Step 4: Therefore, the greatest common factor of 1561 and 1565 is 1