Q: What is the sum of all factors of the number 9,891 excluding 9,891?
A: 6,541
The factors of the number 9,891 are: 1, 3, 7, 9, 21, 63, 157, 471, 1099, 1413, 3297, 9891.
If you add them up, you will get the total of 9,897. Now subtract 9,891 to get 6,541