Factors of 1643

The factors of 1643 are 1, 31, 53, 1643. It has 4 factors.

Factors of 1643

Pick any whole number from 1 to 10,000.

1643 = 31 \times 53

How to work it out

1
A factor of 1643 is a whole number that divides it with nothing left over. You only need to test the numbers up to √1643 ≈ 40.53; 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.
$1643 = 31 \times 53$
4
Add all the factors: 1 + 31 + 53 + 1643 = 1728. Without 1643 itself that is 85, so 1643 is a deficient number.

LaTeX source of the formulas on this page

\[ 1643 = 31 \times 53 \]

Factor	Pairs with	Product
1	1643	1 × 1643 = 1643
31	53	31 × 53 = 1643

What are the factors of 1643?

The factors of 1643 are 1, 31, 53, 1643. It has 4 factors.

What are the prime factors of 1643?

31, 53. As a product: 31 × 53.

How many factors does 1643 have?

1643 has 4 factors (2 factor pairs).

What is the sum of the factors of 1643?

1728.

Is 1643 a prime number?

No. It is divisible by 31, so 1643 = 31 × 53.