2181159804 has 24 divisors (see below), whose sum is σ = 5090128848. Its totient is φ = 726945280.

The previous prime is 2181159793. The next prime is 2181159809. The reversal of 2181159804 is 4089511812.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181159809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146764 + ... + 160940.

It is an arithmetic number, because the mean of its divisors is an integer number (212088702).

Almost surely, 2^2181159804 is an apocalyptic number.

It is an amenable number.

2181159804 is an abundant number, since it is smaller than the sum of its proper divisors (2908969044).

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

2181159804 is a wasteful number, since it uses less digits than its factorization.

2181159804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27005 (or 27003 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 39.

The square root of 2181159804 is about 46702.8886044536. Note that the first 3 decimals coincide. The cubic root of 2181159804 is about 1296.8681621154.

The spelling of 2181159804 in words is "two billion, one hundred eighty-one million, one hundred fifty-nine thousand, eight hundred four".