861587 has 4 divisors (see below), whose sum is σ = 868296. Its totient is φ = 854880.

The previous prime is 861571. The next prime is 861589. The reversal of 861587 is 785168.

It is a happy number.

861587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861587 - 2⁴ = 861571 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861587.

It is not an unprimeable number, because it can be changed into a prime (861589) 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, 3158 + ... + 3419.

It is an arithmetic number, because the mean of its divisors is an integer number (217074).

2⁸⁶¹⁵⁸⁷ is an apocalyptic number.

861587 is a deficient number, since it is larger than the sum of its proper divisors (6709).

861587 is a wasteful number, since it uses less digits than its factorization.

861587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6708.

The product of its digits is 13440, while the sum is 35.

The square root of 861587 is about 928.2171082241. The cubic root of 861587 is about 95.1553138089.

The spelling of 861587 in words is "eight hundred sixty-one thousand, five hundred eighty-seven".