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 $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $625$, $676$, $729$, $784$, $841$, $900$:
- $961 = 31 \times 31$