51520887 has 32 divisors (see below), whose sum is σ = 85317120. Its totient is φ = 30456000.

The previous prime is 51520873. The next prime is 51520891. The reversal of 51520887 is 78802515.

51520887 is a `hidden beast` number, since 51 + 520 + 8 + 87 = 666.

51520887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51520887 - 2¹⁴ = 51504503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520867) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 10062 + ... + 14292.

It is an arithmetic number, because the mean of its divisors is an integer number (2666160).

Almost surely, 2^51520887 is an apocalyptic number.

51520887 is a deficient number, since it is larger than the sum of its proper divisors (33796233).

51520887 is a wasteful number, since it uses less digits than its factorization.

51520887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292 (or 4286 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 51520887 is about 7177.8051659264. The cubic root of 51520887 is about 372.1012341547.

The spelling of 51520887 in words is "fifty-one million, five hundred twenty thousand, eight hundred eighty-seven".