648369989 has 2 divisors, whose sum is σ = 648369990. Its totient is φ = 648369988.

The previous prime is 648369973. The next prime is 648370007. The reversal of 648369989 is 989963846.

648369989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647702500 + 667489 = 25450^2 + 817^2 .

It is a cyclic number.

It is not a de Polignac number, because 648369989 - 2⁴ = 648369973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648362989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324184994 + 324184995.

It is an arithmetic number, because the mean of its divisors is an integer number (324184995).

Almost surely, 2^648369989 is an apocalyptic number.

It is an amenable number.

648369989 is a deficient number, since it is larger than the sum of its proper divisors (1).

648369989 is an equidigital number, since it uses as much as digits as its factorization.

648369989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20155392, while the sum is 62.

The square root of 648369989 is about 25463.1103559640. The cubic root of 648369989 is about 865.5144072921.

The spelling of 648369989 in words is "six hundred forty-eight million, three hundred sixty-nine thousand, nine hundred eighty-nine".