51865869 has 16 divisors (see below), whose sum is σ = 77197824. Its totient is φ = 30702000.

The previous prime is 51865867. The next prime is 51865873. The reversal of 51865869 is 96856815.

51865869 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 51865869 - 2¹ = 51865867 is a prime.

It is a super-2 number, since 2×51865869² = 5380136734250322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51865867) 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, 16857 + ... + 19694.

It is an arithmetic number, because the mean of its divisors is an integer number (4824864).

Almost surely, 2^51865869 is an apocalyptic number.

It is an amenable number.

51865869 is a deficient number, since it is larger than the sum of its proper divisors (25331955).

51865869 is a wasteful number, since it uses less digits than its factorization.

51865869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36608.

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

The square root of 51865869 is about 7201.7962342738. The cubic root of 51865869 is about 372.9299127754.

The spelling of 51865869 in words is "fifty-one million, eight hundred sixty-five thousand, eight hundred sixty-nine".