115555511 has 16 divisors (see below), whose sum is σ = 129288960. Its totient is φ = 102637440.

The previous prime is 115555501. The next prime is 115555513.

It is a happy number.

115555511 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115555511 is a prime.

It is a super-2 number, since 2×115555511² = 26706152244942242, which contains 22 as substring.

It is a Duffinian number.

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 (115555513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111566 + ... + 112596.

It is an arithmetic number, because the mean of its divisors is an integer number (8080560).

Almost surely, 2^115555511 is an apocalyptic number.

115555511 is a deficient number, since it is larger than the sum of its proper divisors (13733449).

115555511 is a wasteful number, since it uses less digits than its factorization.

115555511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414.

The product of its digits is 3125, while the sum is 29.

The square root of 115555511 is about 10749.6749253175. The cubic root of 115555511 is about 487.0761756691.

The spelling of 115555511 in words is "one hundred fifteen million, five hundred fifty-five thousand, five hundred eleven".