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(another Prime Pages' Curiosity)
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+ Together with 541 form the smallest two consecutive primes, such that the sums of the digits are equal. [Smart]

+ A prime (called a RL prime) obtained by concatenating the odd primes alternately on the right and left of the first prime. [Russo]

+ The only three-digit prime containing all three of the first three prime digits. [Patterson]

+ 523! plus the 523rd prime is a titanic prime. [Gupta]

+ The smallest prime formed by concatenating Honaker triplets. [Loungrides]

+ The smallest prime that is followed immediately by 17 composite numbers. [Post]

+ The largest prime with a prime number of distinct prime digits. Note that the remaining prime digit 7 when prefixed (7523) or appended (5237) to it forms two other primes, the reversal of whose product is also a prime (15979393) with all of the odd digits. [Beedassy]

+ The only prime formed from three consecutive primes, one being the sum of the other two. [Silva]

+ Smallest nontrivial prime partial sum of near-repdigit primes: 113 + 199 + 211 = 523 is prime. [Post]

+ Israeli grandmaster Alik Gershon played 523 chess games to break the Guinness Book World Record for the most number of simultaneous matches in October 2010. [McCranie]

+ The smallest prime formed from two adjacent primes with their difference inserted between them. [Loungrides]

(There are 9 curios for this number that have not yet been approved by an editor.)

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