+ The largest palindromic two-sided semiprime. [Gupta]

+ 949 is the only known multidigit palindromic number m such that m*m! - prime(m) is prime. [Firoozbakht]

+ Smallest palindromic number whose all factors are emirps. [Sariyar]

(There are 3 curios for this number that have not yet been approved by an editor.)

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