115909431 has 16 divisors (see below), whose sum is σ = 169478400. Its totient is φ = 69880320.

The previous prime is 115909427. The next prime is 115909439. The reversal of 115909431 is 134909511.

It is not a de Polignac number, because 115909431 - 2² = 115909427 is a prime.

It is a super-2 number, since 2×115909431² = 26869992389487522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 115909392 and 115909401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115909439) 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, 2731 + ... + 15468.

It is an arithmetic number, because the mean of its divisors is an integer number (10592400).

Almost surely, 2^115909431 is an apocalyptic number.

115909431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

115909431 is a deficient number, since it is larger than the sum of its proper divisors (53568969).

115909431 is a wasteful number, since it uses less digits than its factorization.

115909431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18406.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 115909431 is about 10766.1242329819. The cubic root of 115909431 is about 487.5729363588.

The spelling of 115909431 in words is "one hundred fifteen million, nine hundred nine thousand, four hundred thirty-one".