585661 has 4 divisors (see below), whose sum is σ = 595324. Its totient is φ = 576000.

The previous prime is 585653. The next prime is 585671. The reversal of 585661 is 166585.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166585 = 5 ⋅33317.

It can be written as a sum of positive squares in 2 ways, for example, as 202500 + 383161 = 450^2 + 619^2 .

It is a 5-Lehmer number, since φ(585661) divides (585661-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 585661 - 2³ = 585653 is a prime.

It is a Duffinian number.

585661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (585601) 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, 4740 + ... + 4861.

It is an arithmetic number, because the mean of its divisors is an integer number (148831).

2⁵⁸⁵⁶⁶¹ is an apocalyptic number.

It is an amenable number.

585661 is a deficient number, since it is larger than the sum of its proper divisors (9663).

585661 is an equidigital number, since it uses as much as digits as its factorization.

585661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9662.

The product of its digits is 7200, while the sum is 31.

The square root of 585661 is about 765.2849142640. The cubic root of 585661 is about 83.6659541499.

The spelling of 585661 in words is "five hundred eighty-five thousand, six hundred sixty-one".