51509542 has 16 divisors (see below), whose sum is σ = 88395552. Its totient is φ = 22052160.

The previous prime is 51509527. The next prime is 51509561. The reversal of 51509542 is 24590515.

51509542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 21442 + ... + 23722.

It is an arithmetic number, because the mean of its divisors is an integer number (5524722).

Almost surely, 2^51509542 is an apocalyptic number.

51509542 is a deficient number, since it is larger than the sum of its proper divisors (36886010).

51509542 is a wasteful number, since it uses less digits than its factorization.

51509542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 51509542 is about 7177.0148390539. The cubic root of 51509542 is about 372.0739196767.

The spelling of 51509542 in words is "fifty-one million, five hundred nine thousand, five hundred forty-two".