491590 has 32 divisors (see below), whose sum is σ = 997920. Its totient is φ = 172800.

The previous prime is 491581. The next prime is 491591. The reversal of 491590 is 95194.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4456 + ... + 4564.

It is an arithmetic number, because the mean of its divisors is an integer number (31185).

2⁴⁹¹⁵⁹⁰ is an apocalyptic number.

491590 is an abundant number, since it is smaller than the sum of its proper divisors (506330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491590 is a wasteful number, since it uses less digits than its factorization.

491590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 491590 is about 701.1347944582. The cubic root of 491590 is about 78.9225326167.

It can be divided in two parts, 4915 and 90, that added together give a palindrome (5005).

The spelling of 491590 in words is "four hundred ninety-one thousand, five hundred ninety".