491
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Number
$491$ (four hundred and ninety-one) is:
- The $94$th prime number
- The $25$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $53$, $83$, $89$, $113$, $131$, $173$, $179$, $191$, $233$, $239$, $251$, $281$, $293$, $359$, $419$, $431$, $443$:
- $2 \times 491 + 1 = 983$, which is prime.
- The $34$th long period prime after $7$, $17$, $19$, $23$, $29$, $\ldots$, $269$, $313$, $337$, $367$, $379$, $383$, $389$, $419$, $433$, $461$, $487$
Also see
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