This number is a prime.

+ A prime obtained by concatenating in descending order the decimal equivalents of the true minterms in the 3-variable Boolean function F(a,b,c)=abc'+ab'c+a'bc. [Necula]

+ This prime can be expressed as the sum of squares of five consecutive primes: 5^2 + 7^2 + 11^2 + 13^2 + 17^2. [Patterson]

+ The first 3-digit prime number to occur in the decimal expansion of π.

+ The only known prime where 5 is neither a primitive root nor a quadratic residue of 4n2 + 1. [Gudipati]

+ MGMT 653 is a program designed to integrate years of advanced study by Wharton MBA students, as they apply what they have learned to the problems of organizations in the community. [Roberts]

+ The first digit of 653 appears 653 times in triangular numbers with distinct digits only. [Gaydos]

+ "I was up at six fifty-three every morning to exercise." From MATH WARRIORS: Season 1, Episode 1 - "Prime-mates".

(There is one curio for this number that has not yet been approved by an editor.)

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