51138805 has 16 divisors (see below), whose sum is σ = 65392704. Its totient is φ = 38257920.

The previous prime is 51138733. The next prime is 51138851. The reversal of 51138805 is 50883115.

It is not a de Polignac number, because 51138805 - 2⁹ = 51138293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12010 + ... + 15700.

It is an arithmetic number, because the mean of its divisors is an integer number (4087044).

Almost surely, 2^51138805 is an apocalyptic number.

It is an amenable number.

51138805 is a deficient number, since it is larger than the sum of its proper divisors (14253899).

51138805 is a wasteful number, since it uses less digits than its factorization.

51138805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 51138805 is about 7151.1401188901. The cubic root of 51138805 is about 371.1791091538.

The spelling of 51138805 in words is "fifty-one million, one hundred thirty-eight thousand, eight hundred five".