581989 has 4 divisors (see below), whose sum is σ = 612640. Its totient is φ = 551340.

The previous prime is 581983. The next prime is 582011. The reversal of 581989 is 989185.

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, and also an emirpimes, since its reverse is a distinct semiprime: 989185 = 5 ⋅197837.

It is a cyclic number.

It is not a de Polignac number, because 581989 - 2³ = 581981 is a prime.

It is a super-2 number, since 2×581989² = 677422392242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15297 + ... + 15334.

It is an arithmetic number, because the mean of its divisors is an integer number (153160).

2⁵⁸¹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

581989 is a deficient number, since it is larger than the sum of its proper divisors (30651).

581989 is a wasteful number, since it uses less digits than its factorization.

581989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30650.

The product of its digits is 25920, while the sum is 40.

The square root of 581989 is about 762.8820354419. The cubic root of 581989 is about 83.4907300835.

The spelling of 581989 in words is "five hundred eighty-one thousand, nine hundred eighty-nine".