115611805 has 4 divisors (see below), whose sum is σ = 138734172. Its totient is φ = 92489440.

The previous prime is 115611799. The next prime is 115611809. The reversal of 115611805 is 508116511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72012196 + 43599609 = 8486^2 + 6603^2 .

It is not a de Polignac number, because 115611805 - 2⁵ = 115611773 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 (115611809) 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 3 ways as a sum of consecutive naturals, for example, 11561176 + ... + 11561185.

It is an arithmetic number, because the mean of its divisors is an integer number (34683543).

Almost surely, 2^115611805 is an apocalyptic number.

It is an amenable number.

115611805 is a deficient number, since it is larger than the sum of its proper divisors (23122367).

115611805 is an equidigital number, since it uses as much as digits as its factorization.

115611805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23122366.

The product of its (nonzero) digits is 1200, while the sum is 28.

The square root of 115611805 is about 10752.2930112604. The cubic root of 115611805 is about 487.1552574733.

It can be divided in two parts, 11561 and 1805, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 115611805 in words is "one hundred fifteen million, six hundred eleven thousand, eight hundred five".