491539 has 2 divisors, whose sum is σ = 491540. Its totient is φ = 491538.

The previous prime is 491537. The next prime is 491581. The reversal of 491539 is 935194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491539 - 2¹ = 491537 is a prime.

It is a super-2 number, since 2×491539² = 483221177042, which contains 22 as substring.

Together with 491537, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491539.

It is not a weakly prime, because it can be changed into another prime (491531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245769 + 245770.

It is an arithmetic number, because the mean of its divisors is an integer number (245770).

2⁴⁹¹⁵³⁹ is an apocalyptic number.

491539 is a deficient number, since it is larger than the sum of its proper divisors (1).

491539 is an equidigital number, since it uses as much as digits as its factorization.

491539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 31.

The square root of 491539 is about 701.0984239035. The cubic root of 491539 is about 78.9198032498.

The spelling of 491539 in words is "four hundred ninety-one thousand, five hundred thirty-nine".