Is 1521 a deficient number and what is its deficiency?

Is 1521 a deficient number?

Here we will explain and calculate if 1521 is a deficient number and its deficiency if applicable.

1521 is a deficient number if the sum of its proper divisors is less than 1521.

The sum of its proper divisors is calculated as follows: 1 + 3 + 9 + 13 + 39 + 117 + 169 + 507 = 858.

858 is less than 1521. Therefore, 1521 is a deficient number.

The deficiency of 1521 is 1521 minus the sum of its proper divisors. Thus, the deficiency of 1521 is 1521 - 858 = 663

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