115911 has 16 divisors (see below), whose sum is σ = 177120. Its totient is φ = 75816.

The previous prime is 115903. The next prime is 115931. The reversal of 115911 is 119511.

It is not a de Polignac number, because 115911 - 2³ = 115903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2161 + ... + 2213.

It is an arithmetic number, because the mean of its divisors is an integer number (11070).

2¹¹⁵⁹¹¹ is an apocalyptic number.

115911 is a deficient number, since it is larger than the sum of its proper divisors (61209).

115911 is an frugal number, since it uses more digits than its factorization.

115911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 56 counting only the distinct ones).

The product of its digits is 45, while the sum is 18.

The square root of 115911 is about 340.4570457488. The cubic root of 115911 is about 48.7575136348.

Subtracting 115911 from its reverse (119511), we obtain a square (3600 = 60²).

The spelling of 115911 in words is "one hundred fifteen thousand, nine hundred eleven".