115815565 has 8 divisors (see below), whose sum is σ = 139747608. Its totient is φ = 92139840.

The previous prime is 115815563. The next prime is 115815571. The reversal of 115815565 is 565518511.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5103081 + 110712484 = 2259^2 + 10522^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 115815565 - 2¹ = 115815563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115815563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63082 + ... + 64891.

It is an arithmetic number, because the mean of its divisors is an integer number (17468451).

Almost surely, 2^115815565 is an apocalyptic number.

It is an amenable number.

115815565 is a deficient number, since it is larger than the sum of its proper divisors (23932043).

115815565 is a wasteful number, since it uses less digits than its factorization.

115815565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128159.

The product of its digits is 30000, while the sum is 37.

The square root of 115815565 is about 10761.7640282623. The cubic root of 115815565 is about 487.4412850610.

The spelling of 115815565 in words is "one hundred fifteen million, eight hundred fifteen thousand, five hundred sixty-five".