648116509 has 2 divisors, whose sum is σ = 648116510. Its totient is φ = 648116508.

The previous prime is 648116503. The next prime is 648116519. The reversal of 648116509 is 905611846.

648116509 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., 576240025 + 71876484 = 24005^2 + 8478^2 .

It is a cyclic number.

It is not a de Polignac number, because 648116509 - 2³ = 648116501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648116501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324058254 + 324058255.

It is an arithmetic number, because the mean of its divisors is an integer number (324058255).

Almost surely, 2^648116509 is an apocalyptic number.

It is an amenable number.

648116509 is a deficient number, since it is larger than the sum of its proper divisors (1).

648116509 is an equidigital number, since it uses as much as digits as its factorization.

648116509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 648116509 is about 25458.1324727483. The cubic root of 648116509 is about 865.4016017478.

The spelling of 648116509 in words is "six hundred forty-eight million, one hundred sixteen thousand, five hundred nine".