51987567 has 16 divisors (see below), whose sum is σ = 72806400. Its totient is φ = 32933472.

The previous prime is 51987563. The next prime is 51987569. The reversal of 51987567 is 76578915.

51987567 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 51987567 - 2² = 51987563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51987563) 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 15 ways as a sum of consecutive naturals, for example, 8434 + ... + 13232.

It is an arithmetic number, because the mean of its divisors is an integer number (4550400).

Almost surely, 2^51987567 is an apocalyptic number.

51987567 is a deficient number, since it is larger than the sum of its proper divisors (20818833).

51987567 is a wasteful number, since it uses less digits than its factorization.

51987567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4982.

The product of its digits is 529200, while the sum is 48.

The square root of 51987567 is about 7210.2404259497. The cubic root of 51987567 is about 373.2213656752.

The spelling of 51987567 in words is "fifty-one million, nine hundred eighty-seven thousand, five hundred sixty-seven".