659

Number
$659$ (six hundred and fifty-nine) is:


 * The $120$th prime number


 * The $1$st of the $30$th pair of twin primes:
 * $661 - 659 = 2$


 * The $30$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $\ldots$, $233$, $239$, $251$, $281$, $293$, $359$, $419$, $431$, $443$, $491$, $509$, $593$, $641$, $653$:
 * $2 \times 659 + 1 = 1319$, which is prime.