1619

Number
$1619$ (one thousand six hundred and nineteen) is:


 * The $256$th prime number


 * The $35$th safe prime after $5$, $7$, $11$, $23$, $47$, $\ldots$, $839$, $863$, $887$, $983$, $1019$, $1187$, $1283$, $1307$, $1319$, $1367$, $1439$, $1487$, $1523$:
 * $1523 = 2 \times 761 + 1$


 * The smaller of the $52$nd pair of twin primes:
 * $1621 - 1619 = 2$