181681044 has 24 divisors (see below), whose sum is σ = 424183200. Its totient is φ = 60523104.

The previous prime is 181681007. The next prime is 181681067. The reversal of 181681044 is 440186181.

181681044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 181680996 and 181681014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21582 + ... + 28794.

It is an arithmetic number, because the mean of its divisors is an integer number (17674300).

Almost surely, 2^181681044 is an apocalyptic number.

It is an amenable number.

181681044 is an abundant number, since it is smaller than the sum of its proper divisors (242502156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181681044 is a wasteful number, since it uses less digits than its factorization.

181681044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9319 (or 9317 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 181681044 is about 13478.9110836150. The cubic root of 181681044 is about 566.3738659580.

The spelling of 181681044 in words is "one hundred eighty-one million, six hundred eighty-one thousand, forty-four".