Factors of 9991

The factors of 9991 are 1, 97, 103, 9991. It has 4 factors.

Factors of 9991

Pick any whole number from 1 to 10,000.

9991 = 97 \times 103

How to work it out

1
A factor of 9991 is a whole number that divides it with nothing left over. You only need to test the numbers up to √9991 ≈ 99.95; 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.
$9991 = 97 \times 103$
4
Add all the factors: 1 + 97 + 103 + 9991 = 10192. Without 9991 itself that is 201, so 9991 is a deficient number.

LaTeX source of the formulas on this page

\[ 9991 = 97 \times 103 \]

Factor	Pairs with	Product
1	9991	1 × 9991 = 9991
97	103	97 × 103 = 9991

What are the factors of 9991?

The factors of 9991 are 1, 97, 103, 9991. It has 4 factors.

What are the prime factors of 9991?

97, 103. As a product: 97 × 103.

How many factors does 9991 have?

9991 has 4 factors (2 factor pairs).

What is the sum of the factors of 9991?

10192.

Is 9991 a prime number?

No. It is divisible by 97, so 9991 = 97 × 103.