51861138 has 16 divisors (see below), whose sum is σ = 118539840. Its totient is φ = 14817456.

The previous prime is 51861119. The next prime is 51861157. The reversal of 51861138 is 83116815.

51861138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51861119) and next prime (51861157).

It is a junction number, because it is equal to n+sod(n) for n = 51861099 and 51861108.

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 7 ways as a sum of consecutive naturals, for example, 617353 + ... + 617436.

It is an arithmetic number, because the mean of its divisors is an integer number (7408740).

Almost surely, 2^51861138 is an apocalyptic number.

51861138 is an abundant number, since it is smaller than the sum of its proper divisors (66678702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51861138 is a wasteful number, since it uses less digits than its factorization.

51861138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234801.

The product of its digits is 5760, while the sum is 33.

The square root of 51861138 is about 7201.4677670597. The cubic root of 51861138 is about 372.9185733653.

The spelling of 51861138 in words is "fifty-one million, eight hundred sixty-one thousand, one hundred thirty-eight".