274,177

Number
$274 \, 177$ is:


 * The $23 \, 974$th prime.


 * One of the two prime factors of the $6$th Fermat number $2^{\paren {2^6} } + 1$, the other being $67 \, 280 \, 421 \, 310 \, 721$:
 * $274 \, 177 = 1071 \times 2^8 + 1$