491985 has 36 divisors (see below), whose sum is σ = 951132. Its totient is φ = 233856.

The previous prime is 491983. The next prime is 492007. The reversal of 491985 is 589194.

It can be written as a sum of positive squares in 6 ways, for example, as 28224 + 463761 = 168^2 + 681^2 .

It is not a de Polignac number, because 491985 - 2¹ = 491983 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491985.

It is not an unprimeable number, because it can be changed into a prime (491983) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16951 + ... + 16979.

2⁴⁹¹⁹⁸⁵ is an apocalyptic number.

491985 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

491985 is a deficient number, since it is larger than the sum of its proper divisors (459147).

491985 is a wasteful number, since it uses less digits than its factorization.

491985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 50 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 491985 is about 701.4164241020. The cubic root of 491985 is about 78.9436654404.

The spelling of 491985 in words is "four hundred ninety-one thousand, nine hundred eighty-five".