491185 has 8 divisors (see below), whose sum is σ = 593640. Its totient is φ = 390144.

The previous prime is 491171. The next prime is 491201. The reversal of 491185 is 581194.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 59536 + 431649 = 244^2 + 657^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491185 is a prime.

491185 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711 + ... + 1219.

It is an arithmetic number, because the mean of its divisors is an integer number (74205).

2⁴⁹¹¹⁸⁵ is an apocalyptic number.

It is an amenable number.

491185 is a deficient number, since it is larger than the sum of its proper divisors (102455).

491185 is a wasteful number, since it uses less digits than its factorization.

491185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707.

The product of its digits is 1440, while the sum is 28.

The square root of 491185 is about 700.8459174455. The cubic root of 491185 is about 78.9008530276.

Subtracting 491185 from its reverse (581194), we obtain a palindrome (90009).

It can be divided in two parts, 491 and 185, that added together give a palindrome (676).

The spelling of 491185 in words is "four hundred ninety-one thousand, one hundred eighty-five".