Factors of 441

3, 7. As a product: 3^2 × 7^2.

The factors of 441 are 1, 3, 7, 9, 21, 49, 63, 147, 441. It has 9 factors.

Factors of 441

Pick any whole number from 1 to 10,000.

441 = 3^{2} \times 7^{2}

How to work it out

1
A factor of 441 is a whole number that divides it with nothing left over. You only need to test the numbers up to √441 ≈ 21.00; every one that divides gives a pair.
2
The factor pairs are listed in the table below. Together they give 9 factors.
3
Prime factorisation: keep dividing by the smallest prime that fits.
$441 = 3^{2} \times 7^{2}$
4
Add all the factors: 1 + 3 + 7 + 9 + 21 + 49 + 63 + 147 + 441 = 741. Without 441 itself that is 300, so 441 is a deficient number.

LaTeX source of the formulas on this page

\[ 441 = 3^{2} \times 7^{2} \]

What are the factors of 441?

The factors of 441 are 1, 3, 7, 9, 21, 49, 63, 147, 441. It has 9 factors.

What are the prime factors of 441?

3, 7. As a product: $3^{2}$ × $7^{2}$ .

How many factors does 441 have?

441 has 9 factors (5 factor pairs, one of them 21 × 21).

What is the sum of the factors of 441?

741.

Is 441 a prime number?

No. It is divisible by 3, so 441 = 3 × 147.