Q: What is the sum of all factors of the number 9,999,991 excluding 9,999,991?

 A: 1

Why is 1 the sum of all factors of 9,999,991, excluding 9,999,991?

The factors of the number 9,999,991 are: 1, 9999991.

If you add them up, you will get the total of 9,999,992. Now subtract 9,999,991 to get 1


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