115520878289 has 4 divisors (see below), whose sum is σ = 117700517556. Its totient is φ = 113341239024.

The previous prime is 115520878283. The next prime is 115520878301. The reversal of 115520878289 is 982878025511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982878025511 = 3083 ⋅318805717.

It can be written as a sum of positive squares in 2 ways, for example, as 87299566225 + 28221312064 = 295465^2 + 167992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115520878289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (115520878283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089819554 + ... + 1089819659.

It is an arithmetic number, because the mean of its divisors is an integer number (29425129389).

Almost surely, 2^115520878289 is an apocalyptic number.

It is an amenable number.

115520878289 is a deficient number, since it is larger than the sum of its proper divisors (2179639267).

115520878289 is an equidigital number, since it uses as much as digits as its factorization.

115520878289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179639266.

The product of its (nonzero) digits is 3225600, while the sum is 56.

The spelling of 115520878289 in words is "one hundred fifteen billion, five hundred twenty million, eight hundred seventy-eight thousand, two hundred eighty-nine".