115765509 has 32 divisors (see below), whose sum is σ = 166699008. Its totient is φ = 71280000.

The previous prime is 115765483. The next prime is 115765513. The reversal of 115765509 is 905567511.

It is not a de Polignac number, because 115765509 - 2¹² = 115761413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115765519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 427044 + ... + 427314.

It is an arithmetic number, because the mean of its divisors is an integer number (5209344).

Almost surely, 2^115765509 is an apocalyptic number.

It is an amenable number.

115765509 is a deficient number, since it is larger than the sum of its proper divisors (50933499).

115765509 is a wasteful number, since it uses less digits than its factorization.

115765509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489.

The product of its (nonzero) digits is 47250, while the sum is 39.

The square root of 115765509 is about 10759.4381358880. The cubic root of 115765509 is about 487.3710501808.

It can be divided in two parts, 1157 and 65509, that added together give a palindrome (66666).

The spelling of 115765509 in words is "one hundred fifteen million, seven hundred sixty-five thousand, five hundred nine".