Is 1561 a deficient number and what is its deficiency?

Is 1561 a deficient number?

Here we will explain and calculate if 1561 is a deficient number and its deficiency if applicable.

1561 is a deficient number if the sum of its proper divisors is less than 1561.

The sum of its proper divisors is calculated as follows: 1 + 7 + 223 = 231.

231 is less than 1561. Therefore, 1561 is a deficient number.

The deficiency of 1561 is 1561 minus the sum of its proper divisors. Thus, the deficiency of 1561 is 1561 - 231 = 1330

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