648363391 has 16 divisors (see below), whose sum is σ = 778226400. Its totient is φ = 533634048.

The previous prime is 648363379. The next prime is 648363403. The reversal of 648363391 is 193363846.

It is an interprime number because it is at equal distance from previous prime (648363379) and next prime (648363403).

It is a cyclic number.

It is not a de Polignac number, because 648363391 - 2⁹ = 648362879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648363361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73006 + ... + 81403.

It is an arithmetic number, because the mean of its divisors is an integer number (48639150).

Almost surely, 2^648363391 is an apocalyptic number.

648363391 is a deficient number, since it is larger than the sum of its proper divisors (129863009).

648363391 is a wasteful number, since it uses less digits than its factorization.

648363391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154458.

The product of its digits is 279936, while the sum is 43.

The square root of 648363391 is about 25462.9807956571. The cubic root of 648363391 is about 865.5114713740.

The spelling of 648363391 in words is "six hundred forty-eight million, three hundred sixty-three thousand, three hundred ninety-one".