115540431515 has 4 divisors (see below), whose sum is σ = 138648517824. Its totient is φ = 92432345208.

The previous prime is 115540431499. The next prime is 115540431533. The reversal of 115540431515 is 515134045511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515134045511 = 97 ⋅5310660263.

It is a cyclic number.

It is not a de Polignac number, because 115540431515 - 2⁴ = 115540431499 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11554043147 + ... + 11554043156.

It is an arithmetic number, because the mean of its divisors is an integer number (34662129456).

Almost surely, 2^115540431515 is an apocalyptic number.

115540431515 is a deficient number, since it is larger than the sum of its proper divisors (23108086309).

115540431515 is an equidigital number, since it uses as much as digits as its factorization.

115540431515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23108086308.

The product of its (nonzero) digits is 30000, while the sum is 35.

The spelling of 115540431515 in words is "one hundred fifteen billion, five hundred forty million, four hundred thirty-one thousand, five hundred fifteen".