115545509 has 2 divisors, whose sum is σ = 115545510. Its totient is φ = 115545508.

The previous prime is 115545473. The next prime is 115545511. The reversal of 115545509 is 905545511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95609284 + 19936225 = 9778^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 115545509 - 2⁸ = 115545253 is a prime.

Together with 115545511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115545539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57772754 + 57772755.

It is an arithmetic number, because the mean of its divisors is an integer number (57772755).

Almost surely, 2^115545509 is an apocalyptic number.

It is an amenable number.

115545509 is a deficient number, since it is larger than the sum of its proper divisors (1).

115545509 is an equidigital number, since it uses as much as digits as its factorization.

115545509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 115545509 is about 10749.2096918797. The cubic root of 115545509 is about 487.0621221738.

It can be divided in two parts, 1155 and 45509, that added together give a palindrome (46664).

The spelling of 115545509 in words is "one hundred fifteen million, five hundred forty-five thousand, five hundred nine".