What are the divisors of 9611?

1, 7, 1373, 9611

There is a total of 4 positive divisors.
The sum of these divisors is 10992.
The arithmetic mean is 2748.

4 odd divisors

1, 7, 1373, 9611

How to compute the divisors of 9611?

A number N is said to be divisible by a number M (with M non-zero) if, when we divide N by M, the remainder of the division is zero.

$N mod M = 0$

Brute force algorithm

We could start by using a brute-force method which would involve dividing 9611 by each of the numbers from 1 to 9611 to determine which ones have a remainder equal to 0.

$Remainder = N - (M \times ⌊ \frac{N}{M} ⌋)$

(where $⌊ \frac{N}{M} ⌋$ is the integer part of the quotient)

9611 / 1 = 9611 (the remainder is 0, so 1 is a divisor of 9611)
9611 / 2 = 4805.5 (the remainder is 1, so 2 is not a divisor of 9611)
9611 / 3 = 3203.6666666667 (the remainder is 2, so 3 is not a divisor of 9611)
...
9611 / 9610 = 1.0001040582726 (the remainder is 1, so 9610 is not a divisor of 9611)
9611 / 9611 = 1 (the remainder is 0, so 9611 is a divisor of 9611)

Improved algorithm using square-root

However, there is another slightly better approach that reduces the number of iterations by testing only integers less than or equal to the square root of 9611 (i.e. 98.03570778038). Indeed, if a number N has a divisor D greater than its square root, then there is necessarily a smaller divisor d such that:

$D \times d = N$

(thus, if $\frac{N}{D} = d$ , then $\frac{N}{d} = D$ )

9611 / 1 = 9611 (the remainder is 0, so 1 and 9611 are divisors of 9611)
9611 / 2 = 4805.5 (the remainder is 1, so 2 is not a divisor of 9611)
9611 / 3 = 3203.6666666667 (the remainder is 2, so 3 is not a divisor of 9611)
...
9611 / 97 = 99.082474226804 (the remainder is 8, so 97 is not a divisor of 9611)
9611 / 98 = 98.071428571429 (the remainder is 7, so 98 is not a divisor of 9611)