### What are relatively prime numbers / co-prime numbers?

A set of numbers which do not have any other common factor other than 1 are called co-prime or relatively prime numbers. This means those numbers whose HCF is 1.For example, 8 and 9 have no other common factor other than 1 so they are co-prime numbers.

What is a coprime number

**Properties Of Co-prime Numbers:**

• All prime numbers are co-prime to each other.

• Any 2 consecutive integers are always co-prime.

• Sum of any two co-prime numbers is always co-prime with their product.

• 1 is co-prime with all numbers.

• a and b (natural numbers) are co-prime only if the numbers 2a-1 and 2b-1 are co-prime.

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**What are co-prime numbers ?**

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