599

Number
$599$ (five hundred and ninety-nine) is:


 * The $109$th prime number


 * The $9$th obstinate number after $1$, $127$, $149$, $251$, $331$, $337$, $373$, $509$


 * The $1$st of the $27$th pair of twin primes:
 * $601 - 599 = 2$