581609 has 8 divisors (see below), whose sum is σ = 699840. Its totient is φ = 472176.

The previous prime is 581599. The next prime is 581617. The reversal of 581609 is 906185.

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 581609 - 2⁸ = 581353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (581639) 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 7 ways as a sum of consecutive naturals, for example, 2054 + ... + 2319.

It is an arithmetic number, because the mean of its divisors is an integer number (87480).

2⁵⁸¹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

581609 is a deficient number, since it is larger than the sum of its proper divisors (118231).

581609 is a wasteful number, since it uses less digits than its factorization.

581609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4399.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 581609 is about 762.6329392309. The cubic root of 581609 is about 83.4725548345.

The spelling of 581609 in words is "five hundred eighty-one thousand, six hundred nine".