419

Number
$419$ (four hundred and nineteen) is:


 * The $81$st prime number


 * The $1$st of the $22$nd pair of twin primes:
 * $421 - 419 = 2$


 * The $22$nd Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $53$, $83$, $89$, $113$, $131$, $173$, $179$, $191$, $233$, $239$, $251$, $281$, $293$, $359$:
 * $2 \times 419 + 1 = 839$, which is prime.