115805911 has 4 divisors (see below), whose sum is σ = 124714072. Its totient is φ = 106897752.

The previous prime is 115805891. The next prime is 115805927. The reversal of 115805911 is 119508511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119508511 = 10177 ⋅11743.

It is not a de Polignac number, because 115805911 - 2¹⁵ = 115773143 is a prime.

It is a super-2 number, since 2×115805911² = 26822018045079842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115805951) 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 3 ways as a sum of consecutive naturals, for example, 4454061 + ... + 4454086.

It is an arithmetic number, because the mean of its divisors is an integer number (31178518).

Almost surely, 2^115805911 is an apocalyptic number.

115805911 is a deficient number, since it is larger than the sum of its proper divisors (8908161).

115805911 is an equidigital number, since it uses as much as digits as its factorization.

115805911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8908160.

The product of its (nonzero) digits is 1800, while the sum is 31.

The square root of 115805911 is about 10761.3154865007. The cubic root of 115805911 is about 487.4277408569.

The spelling of 115805911 in words is "one hundred fifteen million, eight hundred five thousand, nine hundred eleven".