51185638 has 32 divisors (see below), whose sum is σ = 91526400. Its totient is φ = 21004704.

The previous prime is 51185599. The next prime is 51185653. The reversal of 51185638 is 83658115.

51185638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51185597 and 51185606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55981 + ... + 56887.

It is an arithmetic number, because the mean of its divisors is an integer number (2860200).

Almost surely, 2^51185638 is an apocalyptic number.

51185638 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51185638 is a deficient number, since it is larger than the sum of its proper divisors (40340762).

51185638 is a wasteful number, since it uses less digits than its factorization.

51185638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084.

The product of its digits is 28800, while the sum is 37.

The square root of 51185638 is about 7154.4138823526. The cubic root of 51185638 is about 371.2923833906.

The spelling of 51185638 in words is "fifty-one million, one hundred eighty-five thousand, six hundred thirty-eight".