1,257,787

Number
$1 \, 257 \, 787$ (one million, two hundred and fifty-seven thousand, seven hundred and eighty-seven) is:


 * The $97 \, 017$th prime number


 * The index of the $34$th Mersenne prime after $2$, $3$, $5$, $7$, $13$, $\ldots$, $23 \, 209$, $44 \, 497$, $86 \, 243$, $110 \, 503$, $132 \, 049$, $216 \, 091$, $756 \, 839$, $859 \, 433$:
 * $M_{1 \, 257 \, 787} = 2^{1 \, 257 \, 787} - 1 \approx 4 \cdotp 122 \times 10^{378 \, 631}$