115555599 has 8 divisors (see below), whose sum is σ = 171193520. Its totient is φ = 77037048.

The previous prime is 115555547. The next prime is 115555603. The reversal of 115555599 is 995555511.

115555599 is a `hidden beast` number, since 1 + 1 + 5 + 5 + 55 + 599 = 666.

It is not a de Polignac number, because 115555599 - 2¹² = 115551503 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115555199) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2139892 + ... + 2139945.

It is an arithmetic number, because the mean of its divisors is an integer number (21399190).

Almost surely, 2^115555599 is an apocalyptic number.

115555599 is a deficient number, since it is larger than the sum of its proper divisors (55637921).

115555599 is an equidigital number, since it uses as much as digits as its factorization.

115555599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279846 (or 4279840 counting only the distinct ones).

The product of its digits is 253125, while the sum is 45.

The square root of 115555599 is about 10749.6790184638. The cubic root of 115555599 is about 487.0762993115.

The spelling of 115555599 in words is "one hundred fifteen million, five hundred fifty-five thousand, five hundred ninety-nine".