491585 has 4 divisors (see below), whose sum is σ = 589908. Its totient is φ = 393264.

The previous prime is 491581. The next prime is 491591. The reversal of 491585 is 585194.

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

It can be written as a sum of positive squares in 2 ways, for example, as 229441 + 262144 = 479^2 + 512^2 .

It is a cyclic number.

It is not a de Polignac number, because 491585 - 2² = 491581 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491581) 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, 49154 + ... + 49163.

It is an arithmetic number, because the mean of its divisors is an integer number (147477).

2⁴⁹¹⁵⁸⁵ is an apocalyptic number.

It is an amenable number.

491585 is a deficient number, since it is larger than the sum of its proper divisors (98323).

491585 is an equidigital number, since it uses as much as digits as its factorization.

491585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98322.

The product of its digits is 7200, while the sum is 32.

The square root of 491585 is about 701.1312288010. The cubic root of 491585 is about 78.9222650400.

The spelling of 491585 in words is "four hundred ninety-one thousand, five hundred eighty-five".