115538540809 has 4 divisors (see below), whose sum is σ = 115964882560. Its totient is φ = 115112199060.

The previous prime is 115538540797. The next prime is 115538540839. The reversal of 115538540809 is 908045835511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908045835511 = 2221 ⋅408845491.

It is a cyclic number.

It is not a de Polignac number, because 115538540809 - 2³¹ = 113391057161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115538540839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213170469 + ... + 213171010.

It is an arithmetic number, because the mean of its divisors is an integer number (28991220640).

Almost surely, 2^115538540809 is an apocalyptic number.

It is an amenable number.

115538540809 is a deficient number, since it is larger than the sum of its proper divisors (426341751).

115538540809 is an equidigital number, since it uses as much as digits as its factorization.

115538540809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426341750.

The product of its (nonzero) digits is 864000, while the sum is 49.

The spelling of 115538540809 in words is "one hundred fifteen billion, five hundred thirty-eight million, five hundred forty thousand, eight hundred nine".