491885 has 4 divisors (see below), whose sum is σ = 590268. Its totient is φ = 393504.

The previous prime is 491873. The next prime is 491899. The reversal of 491885 is 588194.

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 162409 + 329476 = 403^2 + 574^2 .

It is a cyclic number.

It is not a de Polignac number, because 491885 - 2¹² = 487789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49184 + ... + 49193.

It is an arithmetic number, because the mean of its divisors is an integer number (147567).

2⁴⁹¹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

491885 is a deficient number, since it is larger than the sum of its proper divisors (98383).

491885 is an equidigital number, since it uses as much as digits as its factorization.

491885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98382.

The product of its digits is 11520, while the sum is 35.

The square root of 491885 is about 701.3451361491. The cubic root of 491885 is about 78.9383164280.

The spelling of 491885 in words is "four hundred ninety-one thousand, eight hundred eighty-five".