961

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Number

$961$ (nine hundred and sixty-one) is:

$31^2$

The $12$th square number after $1$, $4$, $36$, $121$, $144$, $256$, $324$, $400$, $576$, $784$, $900$ to be the divisor sum value of some (strictly) positive integer:

$961 = \map {\sigma_1} {400}$

The $31$st square number after $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $625$, $676$, $729$, $784$, $841$, $900$:

$961 = 31 \times 31$

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