115543891 has 4 divisors (see below), whose sum is σ = 115566984. Its totient is φ = 115520800.

The previous prime is 115543867. The next prime is 115543903. The reversal of 115543891 is 198345511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 115543891 - 2²⁵ = 81989459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115543891.

It is not an unprimeable number, because it can be changed into a prime (115543991) 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, 550 + ... + 15211.

It is an arithmetic number, because the mean of its divisors is an integer number (28891746).

Almost surely, 2^115543891 is an apocalyptic number.

115543891 is a deficient number, since it is larger than the sum of its proper divisors (23093).

115543891 is an equidigital number, since it uses as much as digits as its factorization.

115543891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23092.

The product of its digits is 21600, while the sum is 37.

The square root of 115543891 is about 10749.1344302693. The cubic root of 115543891 is about 487.0598486968.

The spelling of 115543891 in words is "one hundred fifteen million, five hundred forty-three thousand, eight hundred ninety-one".