115545891 has 4 divisors (see below), whose sum is σ = 154061192. Its totient is φ = 77030592.

The previous prime is 115545887. The next prime is 115545893. The reversal of 115545891 is 198545511.

It is a happy number.

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

It is not a de Polignac number, because 115545891 - 2² = 115545887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115545893) 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, 19257646 + ... + 19257651.

It is an arithmetic number, because the mean of its divisors is an integer number (38515298).

Almost surely, 2^115545891 is an apocalyptic number.

115545891 is a deficient number, since it is larger than the sum of its proper divisors (38515301).

115545891 is an equidigital number, since it uses as much as digits as its factorization.

115545891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38515300.

The product of its digits is 36000, while the sum is 39.

The square root of 115545891 is about 10749.2274606132. The cubic root of 115545891 is about 487.0626589249.

The spelling of 115545891 in words is "one hundred fifteen million, five hundred forty-five thousand, eight hundred ninety-one".