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Sound travels just over 331 meters per second in dry (0% humidity) air at zero degrees Celsius. [Necula]

The total population of Rives, Tennessee (the address of one of the authors), as of the 2000 census.

       133 331
      1333 3331
     13333 33331
    133333 333331
   1333333 3333331
  13333333 33333331
 composite and prime

The total number of reduced quadratic forms having one class per genus. [Noe]

The United States conducted 331 atmospheric nuclear bomb tests before the test ban treaty of 1962. [McCranie]

331 = 11*13*17-2^2*3*5^2*7, using only the potential prime divisors (with miltiplicity) up to the square root; and they use all of them. Can you find an expression for the next prime (337) in such a way? [Wood]