51239903 has 16 divisors (see below), whose sum is σ = 63369600. Its totient is φ = 40733280.

The previous prime is 51239863. The next prime is 51239911. The reversal of 51239903 is 30993215.

It is a cyclic number.

It is not a de Polignac number, because 51239903 - 2⁸ = 51239647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51239903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51239983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6713 + ... + 12146.

It is an arithmetic number, because the mean of its divisors is an integer number (3960600).

Almost surely, 2^51239903 is an apocalyptic number.

51239903 is a deficient number, since it is larger than the sum of its proper divisors (12129697).

51239903 is a wasteful number, since it uses less digits than its factorization.

51239903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18902.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 51239903 is about 7158.2052918312. The cubic root of 51239903 is about 371.4235469101.

The spelling of 51239903 in words is "fifty-one million, two hundred thirty-nine thousand, nine hundred three".