1019

Number
$1019$ (one thousand and nineteen) is:


 * The $171$st prime number


 * The $39$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $\ldots$, $653$, $659$, $683$, $719$, $743$, $761$, $809$, $911$, $953$, $1013$:
 * $2 \times 1019 + 1 = 2039$, which is prime.


 * The $8$th of the sequence of $n$ such that $p_n \# + 1$, where $p_n \#$ denotes primorial of $n$, is prime:
 * $2$, $3$, $5$, $7$, $11$, $31$, $379$, $1019$