5681809 has 8 divisors (see below), whose sum is σ = 6583040. Its totient is φ = 4802976.

The previous prime is 5681803. The next prime is 5681861. The reversal of 5681809 is 9081865.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5681809 - 2⁵ = 5681777 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 (5681803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5049 + ... + 6070.

It is an arithmetic number, because the mean of its divisors is an integer number (822880).

It is a Poulet number, since it divides 2^5681808-1.

Almost surely, 2^5681809 is an apocalyptic number.

It is an amenable number.

5681809 is a deficient number, since it is larger than the sum of its proper divisors (901231).

5681809 is a wasteful number, since it uses less digits than its factorization.

5681809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11199.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 5681809 is about 2383.6545471188. The cubic root of 5681809 is about 178.4413677554.

The spelling of 5681809 in words is "five million, six hundred eighty-one thousand, eight hundred nine".