491895 has 24 divisors (see below), whose sum is σ = 904176. Its totient is φ = 246528.

The previous prime is 491873. The next prime is 491899. The reversal of 491895 is 598194.

It is not a de Polignac number, because 491895 - 2⁸ = 491639 is a prime.

491895 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444 + ... + 1086.

It is an arithmetic number, because the mean of its divisors is an integer number (37674).

2⁴⁹¹⁸⁹⁵ is an apocalyptic number.

491895 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

491895 is a deficient number, since it is larger than the sum of its proper divisors (412281).

491895 is a wasteful number, since it uses less digits than its factorization.

491895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 668 counting only the distinct ones).

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

The square root of 491895 is about 701.3522652705. The cubic root of 491895 is about 78.9388513619.

It can be divided in two parts, 49189 and 5, that added together give a palindrome (49194).

The spelling of 491895 in words is "four hundred ninety-one thousand, eight hundred ninety-five".