491945063 has 2 divisors, whose sum is σ = 491945064. Its totient is φ = 491945062.

The previous prime is 491945057. The next prime is 491945071. The reversal of 491945063 is 360549194.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491945063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491945063.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491945263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245972531 + 245972532.

It is an arithmetic number, because the mean of its divisors is an integer number (245972532).

Almost surely, 2^491945063 is an apocalyptic number.

491945063 is a deficient number, since it is larger than the sum of its proper divisors (1).

491945063 is an equidigital number, since it uses as much as digits as its factorization.

491945063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 491945063 is about 22179.8346026295. The cubic root of 491945063 is about 789.4152929224.

The spelling of 491945063 in words is "four hundred ninety-one million, nine hundred forty-five thousand, sixty-three".