593

Number
$593$ (five hundred and ninety-three) is:


 * The $108$th prime number


 * The $27$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $\ldots$, $233$, $239$, $251$, $281$, $293$, $359$, $419$, $431$, $443$, $491$, $509$:
 * $2 \times 593 + 1 = 1187$, which is prime.