1223
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Number
$1223$ (one thousand, two hundred and twenty-three) is:
- The $200$th prime number
- The $19$th balanced prime after $5$, $53$, $157$, $173$, $211$, $257$, $263$, $373$, $563$, $593$, $607$, $653$, $733$, $947$, $977$, $1103$, $1123$, $1187$:
- $1223 = \dfrac {1217 + 1229} 2$
- The $43$rd Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $\ldots$, $761$, $809$, $911$, $953$, $1013$, $1019$, $1031$, $1049$, $1103$:
- $2 \times 1223 + 1 = 2447$, which is prime.
- The $55$th left-truncatable prime after $2$, $3$, $5$, $7$, $\ldots$, $743$, $773$, $797$, $823$, $853$, $883$, $937$, $947$, $953$, $967$, $983$, $997$
Also see
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