Is 691 a deficient number and what is its deficiency?

Is 691 a deficient number?

Here we will explain and calculate if 691 is a deficient number and its deficiency if applicable.

691 is a deficient number if the sum of its proper divisors is less than 691.

The sum of its proper divisors is calculated as follows: 1 = 1.

1 is less than 691. Therefore, 691 is a deficient number.

The deficiency of 691 is 691 minus the sum of its proper divisors. Thus, the deficiency of 691 is 691 - 1 = 690

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