6287

6287 is a prime number.

6287 is a number that cannot be written as a sum of three squares.

6287 is the central term of five successive primes such that their average is a prime.

6287 is an odious number because it has an odd number of 1s in its binary expansion: 22121212.

NGC 6287 is a globular cluster in the constellation Ophiuchus.

Source: On-Line Encyclopedia of Integer Sequences