581987 has 8 divisors (see below), whose sum is σ = 675072. Its totient is φ = 491400.

The previous prime is 581983. The next prime is 582011. The reversal of 581987 is 789185.

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

It is not a de Polignac number, because 581987 - 2² = 581983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 581987.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 581987.

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 7 ways as a sum of consecutive naturals, for example, 89 + ... + 1082.

It is an arithmetic number, because the mean of its divisors is an integer number (84384).

2⁵⁸¹⁹⁸⁷ is an apocalyptic number.

581987 is a deficient number, since it is larger than the sum of its proper divisors (93085).

581987 is a wasteful number, since it uses less digits than its factorization.

581987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249.

The product of its digits is 20160, while the sum is 38.

The square root of 581987 is about 762.8807246221. The cubic root of 581987 is about 83.4906344451.

The spelling of 581987 in words is "five hundred eighty-one thousand, nine hundred eighty-seven".