648404609 has 2 divisors, whose sum is σ = 648404610. Its totient is φ = 648404608.

The previous prime is 648404593. The next prime is 648404623. The reversal of 648404609 is 906404846.

648404609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 448804225 + 199600384 = 21185^2 + 14128^2 .

It is a cyclic number.

It is not a de Polignac number, because 648404609 - 2⁴ = 648404593 is a prime.

It is not a weakly prime, because it can be changed into another prime (648404689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324202304 + 324202305.

It is an arithmetic number, because the mean of its divisors is an integer number (324202305).

Almost surely, 2^648404609 is an apocalyptic number.

It is an amenable number.

648404609 is a deficient number, since it is larger than the sum of its proper divisors (1).

648404609 is an equidigital number, since it uses as much as digits as its factorization.

648404609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 648404609 is about 25463.7901538636. The cubic root of 648404609 is about 865.5298118584.

The spelling of 648404609 in words is "six hundred forty-eight million, four hundred four thousand, six hundred nine".