51501906 has 24 divisors (see below), whose sum is σ = 115721424. Its totient is φ = 17167140.

The previous prime is 51501893. The next prime is 51501949. The reversal of 51501906 is 60910515.

51501906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 51501906.

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 11 ways as a sum of consecutive naturals, for example, 52500 + ... + 53471.

It is an arithmetic number, because the mean of its divisors is an integer number (4821726).

Almost surely, 2^51501906 is an apocalyptic number.

51501906 is an abundant number, since it is smaller than the sum of its proper divisors (64219518).

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

51501906 is a wasteful number, since it uses less digits than its factorization.

51501906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105988 (or 105976 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 51501906 is about 7176.4828432875. The cubic root of 51501906 is about 372.0555328126.

It can be divided in two parts, 5150 and 1906, that added together give a square (7056 = 84²).

The spelling of 51501906 in words is "fifty-one million, five hundred one thousand, nine hundred six".