Is 81 a deficient number and what is its deficiency?

Is 81 a deficient number?

Here we will explain and calculate if 81 is a deficient number and its deficiency if applicable.

81 is a deficient number if the sum of its proper divisors is less than 81.

The sum of its proper divisors is calculated as follows: 1 + 3 + 9 + 27 = 40.

40 is less than 81. Therefore, 81 is a deficient number.

The deficiency of 81 is 81 minus the sum of its proper divisors. Thus, the deficiency of 81 is 81 - 40 = 41

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