131

Number
$131$ (one hundred and thirty-one) is:


 * The $32$nd prime number


 * The $12$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $53$, $83$, $89$, $113$:
 * $2 \times 131 + 1 = 263$, which is prime


 * The $7$th palindromic prime after $2$, $3$, $5$, $7$, $11$, $101$


 * The $15$th permutable prime after $2$, $3$, $5$, $7$, $11$, $13$, $17$, $31$, $37$, $71$, $73$, $79$, $97$, $113$


 * The decimal expansion of its reciprocal has the maximum period, that is: $130$:
 * $1 / 131 = \cdots$


 * It also contains an equal number ($13$) of each of the digits from $0$ to $9$.


 * It is the $2$nd positive integer whose reciprocal has this property.

Also see