115188891 has 4 divisors (see below), whose sum is σ = 153585192. Its totient is φ = 76792592.

The previous prime is 115188877. The next prime is 115188893. The reversal of 115188891 is 198881511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198881511 = 3 ⋅66293837.

It is a cyclic number.

It is not a de Polignac number, because 115188891 - 2¹⁴ = 115172507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115188893) 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, 19198146 + ... + 19198151.

It is an arithmetic number, because the mean of its divisors is an integer number (38396298).

Almost surely, 2^115188891 is an apocalyptic number.

115188891 is a deficient number, since it is larger than the sum of its proper divisors (38396301).

115188891 is an equidigital number, since it uses as much as digits as its factorization.

115188891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38396300.

The product of its digits is 23040, while the sum is 42.

The square root of 115188891 is about 10732.6087695397. The cubic root of 115188891 is about 486.5605185917.

The spelling of 115188891 in words is "one hundred fifteen million, one hundred eighty-eight thousand, eight hundred ninety-one".