51239906 has 16 divisors (see below), whose sum is σ = 80353728. Its totient is φ = 24459600.

The previous prime is 51239863. The next prime is 51239911. The reversal of 51239906 is 60993215.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46421 + ... + 47511.

It is an arithmetic number, because the mean of its divisors is an integer number (5022108).

Almost surely, 2^51239906 is an apocalyptic number.

51239906 is a deficient number, since it is larger than the sum of its proper divisors (29113822).

51239906 is a wasteful number, since it uses less digits than its factorization.

51239906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 51239906 is about 7158.2055013809. The cubic root of 51239906 is about 371.4235541588.

The spelling of 51239906 in words is "fifty-one million, two hundred thirty-nine thousand, nine hundred six".