Factors of 2561

The factors of 2561 are 1, 13, 197, 2561. It has 4 factors.

Factors of 2561

Pick any whole number from 1 to 10,000.

2561 = 13 \times 197

How to work it out

1
A factor of 2561 is a whole number that divides it with nothing left over. You only need to test the numbers up to √2561 ≈ 50.61; every one that divides gives a pair.
2
The factor pairs are listed in the table below. Together they give 4 factors.
3
Prime factorisation: keep dividing by the smallest prime that fits.
$2561 = 13 \times 197$
4
Add all the factors: 1 + 13 + 197 + 2561 = 2772. Without 2561 itself that is 211, so 2561 is a deficient number.

LaTeX source of the formulas on this page

\[ 2561 = 13 \times 197 \]

Factor	Pairs with	Product
1	2561	1 × 2561 = 2561
13	197	13 × 197 = 2561

What are the factors of 2561?

The factors of 2561 are 1, 13, 197, 2561. It has 4 factors.

What are the prime factors of 2561?

13, 197. As a product: 13 × 197.

How many factors does 2561 have?

2561 has 4 factors (2 factor pairs).

What is the sum of the factors of 2561?

2772.

Is 2561 a prime number?

No. It is divisible by 13, so 2561 = 13 × 197.