5581641809 has 4 divisors (see below), whose sum is σ = 5588525040. Its totient is φ = 5574758580.

The previous prime is 5581641743. The next prime is 5581641811. The reversal of 5581641809 is 9081461855.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5581641809 - 2⁸ = 5581641553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5581641889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3440399 + ... + 3442020.

It is an arithmetic number, because the mean of its divisors is an integer number (1397131260).

Almost surely, 2^5581641809 is an apocalyptic number.

It is an amenable number.

5581641809 is a deficient number, since it is larger than the sum of its proper divisors (6883231).

5581641809 is an equidigital number, since it uses as much as digits as its factorization.

5581641809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6883230.

The product of its (nonzero) digits is 345600, while the sum is 47.

The square root of 5581641809 is about 74710.3862190526. The cubic root of 5581641809 is about 1773.8653658755.

The spelling of 5581641809 in words is "five billion, five hundred eighty-one million, six hundred forty-one thousand, eight hundred nine".