1229

Number
$1229$ (one thousand, two hundred and twenty-nine) is:


 * The $201$st prime number


 * The $1$st of the $42$nd pair of twin primes:
 * $1231 - 1229 = 2$


 * The number of primes with no more than $4$ digits:
 * $2$, $3$, $5$, $7$, $11$, $13$, $17$, $19$, $23$, $\ldots$, $9907$, $9923$, $9929$, $9931$, $9941$, $9949$, $9967$, $9973$


 * The $44$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $\ldots$, $761$, $809$, $911$, $953$, $1013$, $1019$, $1031$, $1049$, $1103$, $1223$:
 * $2 \times 1229 + 1 = 2459$, which is prime.