115811559 has 8 divisors (see below), whose sum is σ = 171572720. Its totient is φ = 77207688.

The previous prime is 115811543. The next prime is 115811561. The reversal of 115811559 is 955118511.

115811559 is a `hidden beast` number, since 11 + 581 + 15 + 59 = 666.

It is not a de Polignac number, because 115811559 - 2⁴ = 115811543 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 (115811539) 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, 2144632 + ... + 2144685.

It is an arithmetic number, because the mean of its divisors is an integer number (21446590).

Almost surely, 2^115811559 is an apocalyptic number.

115811559 is a deficient number, since it is larger than the sum of its proper divisors (55761161).

115811559 is an equidigital number, since it uses as much as digits as its factorization.

115811559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289326 (or 4289320 counting only the distinct ones).

The product of its digits is 9000, while the sum is 36.

The square root of 115811559 is about 10761.5779047498. The cubic root of 115811559 is about 487.4356648829.

The spelling of 115811559 in words is "one hundred fifteen million, eight hundred eleven thousand, five hundred fifty-nine".