648242863 has 2 divisors, whose sum is σ = 648242864. Its totient is φ = 648242862.

The previous prime is 648242839. The next prime is 648242897. The reversal of 648242863 is 368242846.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648242863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648242363) 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, 324121431 + 324121432.

It is an arithmetic number, because the mean of its divisors is an integer number (324121432).

Almost surely, 2^648242863 is an apocalyptic number.

648242863 is a deficient number, since it is larger than the sum of its proper divisors (1).

648242863 is an equidigital number, since it uses as much as digits as its factorization.

648242863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 442368, while the sum is 43.

The square root of 648242863 is about 25460.6139556767. The cubic root of 648242863 is about 865.4578364152.

The spelling of 648242863 in words is "six hundred forty-eight million, two hundred forty-two thousand, eight hundred sixty-three".