Factors of 161

All factors of 161

Here are all 4 factors of 161, listed from smallest to largest.

Factor pairs of 161

These 2 pairs of whole numbers each multiply to give 161.

Prime factorization of 161

Dividing 161 by the smallest prime at each step gives its prime factorization:

The distinct prime factors of 161 are 7, 23. To factorize any other number, use the prime factorization calculator.

Factor tree of 161

A factor tree shows the same prime factorization visually. Each composite branch splits until every endpoint is a prime number.

Properties of 161

What makes 161 interesting

• 161 is a composite number, meaning it has more than two factors. It can be written as a product of smaller whole numbers in 2 different ways.
• 161 is a deficient number: its proper factors sum to 31, which is 130 less than 161 itself.

How to find the factors of 161 yourself

Divide 161 by each whole number starting from 1. Whenever the division leaves no remainder, both the divisor and the quotient are factors. You only need to test up to √161 ≈ 12.69, because every factor above that pairs with one below it.

Reading both columns gives every factor: 1, 7, 23, 161. The factor calculator does this automatically for any number.