2181547823 has 24 divisors (see below), whose sum is σ = 2792872800. Its totient is φ = 1666514304.

The previous prime is 2181547811. The next prime is 2181547867. The reversal of 2181547823 is 3287451812.

It is not a de Polignac number, because 2181547823 - 2⁴ = 2181547807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181547883) 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, 2513 + ... + 66101.

It is an arithmetic number, because the mean of its divisors is an integer number (116369700).

Almost surely, 2^2181547823 is an apocalyptic number.

2181547823 is a deficient number, since it is larger than the sum of its proper divisors (611324977).

2181547823 is a wasteful number, since it uses less digits than its factorization.

2181547823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63651 (or 63638 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 2181547823 is about 46707.0425417838. The cubic root of 2181547823 is about 1296.9450599887.

The spelling of 2181547823 in words is "two billion, one hundred eighty-one million, five hundred forty-seven thousand, eight hundred twenty-three".