181242188 has 6 divisors (see below), whose sum is σ = 317173836. Its totient is φ = 90621092.

The previous prime is 181242161. The next prime is 181242209. The reversal of 181242188 is 881242181.

It is a happy number.

It is a super-2 number, since 2×181242188² = 65697461422054688, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22655270 + ... + 22655277.

It is an arithmetic number, because the mean of its divisors is an integer number (52862306).

Almost surely, 2^181242188 is an apocalyptic number.

It is an amenable number.

181242188 is a deficient number, since it is larger than the sum of its proper divisors (135931648).

181242188 is a wasteful number, since it uses less digits than its factorization.

181242188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45310551 (or 45310549 counting only the distinct ones).

The product of its digits is 8192, while the sum is 35.

The square root of 181242188 is about 13462.6218843136. The cubic root of 181242188 is about 565.9174672701.

The spelling of 181242188 in words is "one hundred eighty-one million, two hundred forty-two thousand, one hundred eighty-eight".