5581809081 has 12 divisors (see below), whose sum is σ = 8091106608. Its totient is φ = 3708055224.

The previous prime is 5581809071. The next prime is 5581809097. The reversal of 5581809081 is 1809081855.

5581809081 is a `hidden beast` number, since 558 + 1 + 8 + 0 + 90 + 8 + 1 = 666.

It is not a de Polignac number, because 5581809081 - 2⁹ = 5581808569 is a prime.

It is a super-2 number, since 2×5581809081² = 62313185233468129122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5581809071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1093215 + ... + 1098308.

It is an arithmetic number, because the mean of its divisors is an integer number (674258884).

Almost surely, 2^5581809081 is an apocalyptic number.

It is an amenable number.

5581809081 is a deficient number, since it is larger than the sum of its proper divisors (2509297527).

5581809081 is a wasteful number, since it uses less digits than its factorization.

5581809081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191812 (or 2191809 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 45.

The square root of 5581809081 is about 74711.5056801829. The cubic root of 5581809081 is about 1773.8830855748.

The spelling of 5581809081 in words is "five billion, five hundred eighty-one million, eight hundred nine thousand, eighty-one".