181242189 has 6 divisors (see below), whose sum is σ = 261794286. Its totient is φ = 120828120.

The previous prime is 181242161. The next prime is 181242209. The reversal of 181242189 is 981242181.

It is a happy number.

181242189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 103184964 + 78057225 = 10158^2 + 8835^2 .

It is not a de Polignac number, because 181242189 - 2⁵ = 181242157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181242689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10069002 + ... + 10069019.

It is an arithmetic number, because the mean of its divisors is an integer number (43632381).

Almost surely, 2^181242189 is an apocalyptic number.

It is an amenable number.

181242189 is a deficient number, since it is larger than the sum of its proper divisors (80552097).

181242189 is a wasteful number, since it uses less digits than its factorization.

181242189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20138027 (or 20138024 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 181242189 is about 13462.6219214535. The cubic root of 181242189 is about 565.9174683110.

The spelling of 181242189 in words is "one hundred eighty-one million, two hundred forty-two thousand, one hundred eighty-nine".