2204865891 has 6 divisors (see below), whose sum is σ = 3184806300. Its totient is φ = 1469910588.

The previous prime is 2204865889. The next prime is 2204865899. The reversal of 2204865891 is 1985684022.

2204865891 is a `hidden beast` number, since 2 + 20 + 48 + 6 + 589 + 1 = 666.

2204865891 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 2204865891 - 2¹ = 2204865889 is a prime.

It is a super-2 number, since 2×2204865891² = 9722867194590447762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2204865899) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122492541 + ... + 122492558.

It is an arithmetic number, because the mean of its divisors is an integer number (530801050).

Almost surely, 2^2204865891 is an apocalyptic number.

2204865891 is a deficient number, since it is larger than the sum of its proper divisors (979940409).

2204865891 is a wasteful number, since it uses less digits than its factorization.

2204865891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244985105 (or 244985102 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 2204865891 is about 46955.9995208280. Note that the first 3 decimals coincide. The cubic root of 2204865891 is about 1301.5496099102.

Adding to 2204865891 its sum of digits (45), we get a square (2204865936 = 46956²).

The spelling of 2204865891 in words is "two billion, two hundred four million, eight hundred sixty-five thousand, eight hundred ninety-one".