180843561 has 24 divisors (see below), whose sum is σ = 265649280. Its totient is φ = 118531296.

The previous prime is 180843541. The next prime is 180843571. The reversal of 180843561 is 165348081.

180843561 is a `hidden beast` number, since 18 + 0 + 84 + 3 + 561 = 666.

180843561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 180843561 - 2⁵ = 180843529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (180843541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 246351 + ... + 247083.

It is an arithmetic number, because the mean of its divisors is an integer number (11068720).

Almost surely, 2^180843561 is an apocalyptic number.

It is an amenable number.

180843561 is a deficient number, since it is larger than the sum of its proper divisors (84805719).

180843561 is a wasteful number, since it uses less digits than its factorization.

180843561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 180843561 is about 13447.8087806155. The cubic root of 180843561 is about 565.5022667111.

It can be divided in two parts, 1808 and 43561, that added together give a square (45369 = 213²).

The spelling of 180843561 in words is "one hundred eighty million, eight hundred forty-three thousand, five hundred sixty-one".