1451

Number
$1451$ (one thousand, four hundred and fifty-one) is:


 * The $230$th prime number.


 * The $1$st of the $48$th pair of twin primes:
 * $1453 - 1451 = 2$


 * The $48$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $\ldots$, $1031$, $1049$, $1103$, $1223$, $1229$, $1289$, $1409$, $1439$:
 * $2 \times 1451 + 1 = 2903$, which is prime.