491538 has 32 divisors (see below), whose sum is σ = 1071360. Its totient is φ = 149760.

The previous prime is 491537. The next prime is 491539. The reversal of 491538 is 835194.

491538 is nontrivially palindromic in base 14.

It is an interprime number because it is at equal distance from previous prime (491537) and next prime (491539).

It is not an unprimeable number, because it can be changed into a prime (491531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6183 + ... + 6261.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2⁴⁹¹⁵³⁸ is an apocalyptic number.

491538 is an abundant number, since it is smaller than the sum of its proper divisors (579822).

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

491538 is a wasteful number, since it uses less digits than its factorization.

491538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162.

The product of its digits is 4320, while the sum is 30.

The square root of 491538 is about 701.0977107365. The cubic root of 491538 is about 78.9197497309.

The spelling of 491538 in words is "four hundred ninety-one thousand, five hundred thirty-eight".