51865689 has 4 divisors (see below), whose sum is σ = 69154256. Its totient is φ = 34577124.

The previous prime is 51865679. The next prime is 51865703. The reversal of 51865689 is 98656815.

51865689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51865689 - 2⁴ = 51865673 is a prime.

It is a super-3 number, since 3×51865689³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51865669) 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 3 ways as a sum of consecutive naturals, for example, 8644279 + ... + 8644284.

It is an arithmetic number, because the mean of its divisors is an integer number (17288564).

Almost surely, 2^51865689 is an apocalyptic number.

It is an amenable number.

51865689 is a deficient number, since it is larger than the sum of its proper divisors (17288567).

51865689 is a wasteful number, since it uses less digits than its factorization.

51865689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17288566.

The product of its digits is 518400, while the sum is 48.

The square root of 51865689 is about 7201.7837373806. The cubic root of 51865689 is about 372.9294813583.

The spelling of 51865689 in words is "fifty-one million, eight hundred sixty-five thousand, six hundred eighty-nine".