181898845 has 16 divisors (see below), whose sum is σ = 227265840. Its totient is φ = 139636224.

The previous prime is 181898819. The next prime is 181898863. The reversal of 181898845 is 548898181.

It can be written as a sum of positive squares in 8 ways, for example, as 11909401 + 169989444 = 3451^2 + 13038^2 .

It is not a de Polignac number, because 181898845 - 2¹¹ = 181896797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181898792 and 181898801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6771 + ... + 20239.

It is an arithmetic number, because the mean of its divisors is an integer number (14204115).

Almost surely, 2^181898845 is an apocalyptic number.

It is an amenable number.

181898845 is a deficient number, since it is larger than the sum of its proper divisors (45366995).

181898845 is a wasteful number, since it uses less digits than its factorization.

181898845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13584.

The product of its digits is 737280, while the sum is 52.

The square root of 181898845 is about 13486.9879884280. The cubic root of 181898845 is about 566.6001004084.

The spelling of 181898845 in words is "one hundred eighty-one million, eight hundred ninety-eight thousand, eight hundred forty-five".