1289

Number
$1289$ (one thousand, two hundred and eighty-nine) is:


 * The $209$th prime number


 * The $1$st of the $44$th pair of twin primes:
 * $1291 - 1289 = 2$


 * The $45$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $\ldots$, $761$, $809$, $911$, $953$, $1013$, $1019$, $1031$, $1049$, $1103$, $1223$, $1229$:
 * $2 \times 1289 + 1 = 2579$, which is prime.