115810865 has 16 divisors (see below), whose sum is σ = 146361600. Its totient is φ = 87797952.

The previous prime is 115810861. The next prime is 115810889. The reversal of 115810865 is 568018511.

It is a cyclic number.

It is not a de Polignac number, because 115810865 - 2² = 115810861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115810861) 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, 7916 + ... + 17154.

It is an arithmetic number, because the mean of its divisors is an integer number (9147600).

Almost surely, 2^115810865 is an apocalyptic number.

It is an amenable number.

115810865 is a deficient number, since it is larger than the sum of its proper divisors (30550735).

115810865 is a wasteful number, since it uses less digits than its factorization.

115810865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9376.

The product of its (nonzero) digits is 9600, while the sum is 35.

The square root of 115810865 is about 10761.5456603594. The cubic root of 115810865 is about 487.4346912293.

The spelling of 115810865 in words is "one hundred fifteen million, eight hundred ten thousand, eight hundred sixty-five".