587661 has 4 divisors (see below), whose sum is σ = 783552. Its totient is φ = 391772.

The previous prime is 587659. The next prime is 587669. The reversal of 587661 is 166785.

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.

It is a cyclic number.

It is not a de Polignac number, because 587661 - 2¹ = 587659 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (587669) 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, 97941 + ... + 97946.

It is an arithmetic number, because the mean of its divisors is an integer number (195888).

2⁵⁸⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

587661 is a deficient number, since it is larger than the sum of its proper divisors (195891).

587661 is a wasteful number, since it uses less digits than its factorization.

587661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195890.

The product of its digits is 10080, while the sum is 33.

The square root of 587661 is about 766.5905034632. The cubic root of 587661 is about 83.7610841497.

The spelling of 587661 in words is "five hundred eighty-seven thousand, six hundred sixty-one".