115515523 has 4 divisors (see below), whose sum is σ = 116358840. Its totient is φ = 114672208.

The previous prime is 115515479. The next prime is 115515539. The reversal of 115515523 is 325515511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325515511 = 197 ⋅1652363.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115515523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115515491 and 115515500.

It is not an unprimeable number, because it can be changed into a prime (115515553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421453 + ... + 421726.

It is an arithmetic number, because the mean of its divisors is an integer number (29089710).

Almost surely, 2^115515523 is an apocalyptic number.

115515523 is a deficient number, since it is larger than the sum of its proper divisors (843317).

115515523 is an equidigital number, since it uses as much as digits as its factorization.

115515523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843316.

The product of its digits is 3750, while the sum is 28.

The square root of 115515523 is about 10747.8148011584. The cubic root of 115515523 is about 487.0199849284.

The spelling of 115515523 in words is "one hundred fifteen million, five hundred fifteen thousand, five hundred twenty-three".