649937609 has 2 divisors, whose sum is σ = 649937610. Its totient is φ = 649937608.

The previous prime is 649937567. The next prime is 649937653. The reversal of 649937609 is 906739946.

649937609 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., 614891209 + 35046400 = 24797^2 + 5920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649937609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649937689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324968804 + 324968805.

It is an arithmetic number, because the mean of its divisors is an integer number (324968805).

Almost surely, 2^649937609 is an apocalyptic number.

It is an amenable number.

649937609 is a deficient number, since it is larger than the sum of its proper divisors (1).

649937609 is an equidigital number, since it uses as much as digits as its factorization.

649937609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 53.

The square root of 649937609 is about 25493.8739504219. The cubic root of 649937609 is about 866.2113888007.

The spelling of 649937609 in words is "six hundred forty-nine million, nine hundred thirty-seven thousand, six hundred nine".