115566403 has 4 divisors (see below), whose sum is σ = 115769368. Its totient is φ = 115363440.

The previous prime is 115566397. The next prime is 115566433. The reversal of 115566403 is 304665511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304665511 = 37 ⋅8234203.

It is a cyclic number.

It is not a de Polignac number, because 115566403 - 2⁵ = 115566371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115566433) 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, 100626 + ... + 101767.

It is an arithmetic number, because the mean of its divisors is an integer number (28942342).

Almost surely, 2^115566403 is an apocalyptic number.

115566403 is a deficient number, since it is larger than the sum of its proper divisors (202965).

115566403 is an equidigital number, since it uses as much as digits as its factorization.

115566403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202964.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 115566403 is about 10750.1815333510. The cubic root of 115566403 is about 487.0914787529.

The spelling of 115566403 in words is "one hundred fifteen million, five hundred sixty-six thousand, four hundred three".