653
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".