115305309 has 16 divisors (see below), whose sum is σ = 195226240. Its totient is φ = 65888640.

The previous prime is 115305301. The next prime is 115305367. The reversal of 115305309 is 903503511.

It is not a de Polignac number, because 115305309 - 2³ = 115305301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115305301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304852 + ... + 305229.

It is an arithmetic number, because the mean of its divisors is an integer number (12201640).

Almost surely, 2^115305309 is an apocalyptic number.

It is an amenable number.

115305309 is a deficient number, since it is larger than the sum of its proper divisors (79920931).

115305309 is an equidigital number, since it uses as much as digits as its factorization.

115305309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610097 (or 610091 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 27.

The square root of 115305309 is about 10738.0309647533. The cubic root of 115305309 is about 486.7243808349.

The spelling of 115305309 in words is "one hundred fifteen million, three hundred five thousand, three hundred nine".