53

This number is a prime.

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The smallest prime Takeuchi number. [Post]

Conjectured largest prime p such that there are no twin primes between p^2 and (p+1)^2. [Post]

The smallest odd prime distance of Fibonacci(n) to the closest prime which is not Fibonacci(n) itself. In this case, n = 9. Fibonacci(9) = 34, which is distance 3 from both 31 and 37. [Post]

After 53 hours' non-stop swimming, Diana Nyad reached Key West, Florida, escorted by boats and her team of 35 (reversal of 53) people. [Post]

53 is the smallest super-prime leader: right-truncatable prime p with property that appending any single decimal digit to p does not produce a prime. [Post]

Jules [Gabriel] Verne, "The Father of Science Fiction" and a major figure of literature in France, set "From the Earth to the Moon" in 1869, exactly 100 years before the first human Moon landing. He correctly had the launch from Florida, and splashdown in the ocean. 53 years after his death, the 1958 film "From the Earth to the Moon" directed by Raoul Walsh was released. [Post]