648017399 has 2 divisors, whose sum is σ = 648017400. Its totient is φ = 648017398.

The previous prime is 648017369. The next prime is 648017449. The reversal of 648017399 is 993710846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648017399 - 2⁸ = 648017143 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648017309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324008699 + 324008700.

It is an arithmetic number, because the mean of its divisors is an integer number (324008700).

Almost surely, 2^648017399 is an apocalyptic number.

648017399 is a deficient number, since it is larger than the sum of its proper divisors (1).

648017399 is an equidigital number, since it uses as much as digits as its factorization.

648017399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 648017399 is about 25456.1858690574. The cubic root of 648017399 is about 865.3574870843.

The spelling of 648017399 in words is "six hundred forty-eight million, seventeen thousand, three hundred ninety-nine".