491364563 has 2 divisors, whose sum is σ = 491364564. Its totient is φ = 491364562.

The previous prime is 491364553. The next prime is 491364581. The reversal of 491364563 is 365463194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491364563 - 2⁴ = 491364547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491364563.

It is not a weakly prime, because it can be changed into another prime (491364553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245682281 + 245682282.

It is an arithmetic number, because the mean of its divisors is an integer number (245682282).

Almost surely, 2^491364563 is an apocalyptic number.

491364563 is a deficient number, since it is larger than the sum of its proper divisors (1).

491364563 is an equidigital number, since it uses as much as digits as its factorization.

491364563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 41.

The square root of 491364563 is about 22166.7445286853. The cubic root of 491364563 is about 789.1046647792.

The spelling of 491364563 in words is "four hundred ninety-one million, three hundred sixty-four thousand, five hundred sixty-three".