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