Is 1991 a deficient number and what is its deficiency?

Is 1991 a deficient number?

Here we will explain and calculate if 1991 is a deficient number and its deficiency if applicable.

1991 is a deficient number if the sum of its proper divisors is less than 1991.

The sum of its proper divisors is calculated as follows: 1 + 11 + 181 = 193.

193 is less than 1991. Therefore, 1991 is a deficient number.

The deficiency of 1991 is 1991 minus the sum of its proper divisors. Thus, the deficiency of 1991 is 1991 - 193 = 1798

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