581887 has 4 divisors (see below), whose sum is σ = 592920. Its totient is φ = 570856.

The previous prime is 581873. The next prime is 581891. The reversal of 581887 is 788185.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788185 = 5 ⋅157637.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-581887 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 (581857) 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, 5437 + ... + 5542.

It is an arithmetic number, because the mean of its divisors is an integer number (148230).

2⁵⁸¹⁸⁸⁷ is an apocalyptic number.

581887 is a deficient number, since it is larger than the sum of its proper divisors (11033).

581887 is a wasteful number, since it uses less digits than its factorization.

581887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11032.

The product of its digits is 17920, while the sum is 37.

The square root of 581887 is about 762.8151807614. The cubic root of 581887 is about 83.4858522410.

The spelling of 581887 in words is "five hundred eighty-one thousand, eight hundred eighty-seven".