11,881

Number
$11 \, 881$ (eleven thousand, eight hundred and eighty-one) is:


 * $109^2$


 * The $18$th square after $1$, $4$, $9$, $16$, $25$, $36$, $49$, $64$, $81$, $121$, $144$, $225$, $441$, $484$, $676$, $1444$, $7744$ which has no more than $2$ distinct digits and does not end in $0$:
 * $11 \, 881 = 109^2$


 * The $109$th square number:
 * $11 \, 881 = 109 \times 109$