1229

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Number

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

The $201$st prime number

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 smaller of the $42$nd pair of twin primes:

$1231 - 1229 = 2$

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.

Also see

• Previous  ... Next: Numbers of Primes with at most n Digits
• Previous  ... Next: Prime Number
• Previous  ... Next: Twin Primes
• Previous  ... Next: Sophie Germain Prime