188231089 has 4 divisors (see below), whose sum is σ = 199303524. Its totient is φ = 177158656.

The previous prime is 188231059. The next prime is 188231117. The reversal of 188231089 is 980132881.

188231089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 125821089 + 62410000 = 11217^2 + 7900^2 .

It is a cyclic number.

It is not a de Polignac number, because 188231089 - 2⁹ = 188230577 is a prime.

It is a super-2 number, since 2×188231089² = 70861885732251842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188231059) 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, 5536192 + ... + 5536225.

It is an arithmetic number, because the mean of its divisors is an integer number (49825881).

Almost surely, 2^188231089 is an apocalyptic number.

It is an amenable number.

188231089 is a deficient number, since it is larger than the sum of its proper divisors (11072435).

188231089 is a wasteful number, since it uses less digits than its factorization.

188231089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11072434.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 188231089 is about 13719.7335615529. The cubic root of 188231089 is about 573.1000569443.

The spelling of 188231089 in words is "one hundred eighty-eight million, two hundred thirty-one thousand, eighty-nine".