261

Number
$261$ (two hundred and sixty-one) is:


 * $3 \times 87$


 * The $49$th lucky number:
 * $1$, $3$, $7$, $9$, $13$, $15$, $21$, $\ldots$, $219$, $223$, $231$, $235$, $237$, $241$, $259$, $261$, $\ldots$


 * The $11$th inconsummate number after $62, 63, 65, 75, 84, 95, 161, 173, 195, 216$:
 * $\nexists n \in \Z_{>0}: n = 261 \times s_{10} \left({n}\right)$