649904089 has 2 divisors, whose sum is σ = 649904090. Its totient is φ = 649904088.

The previous prime is 649904081. The next prime is 649904111. The reversal of 649904089 is 980409946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 566820864 + 83083225 = 23808^2 + 9115^2 .

It is a cyclic number.

It is not a de Polignac number, because 649904089 - 2³ = 649904081 is a prime.

It is not a weakly prime, because it can be changed into another prime (649904081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324952044 + 324952045.

It is an arithmetic number, because the mean of its divisors is an integer number (324952045).

Almost surely, 2^649904089 is an apocalyptic number.

It is an amenable number.

649904089 is a deficient number, since it is larger than the sum of its proper divisors (1).

649904089 is an equidigital number, since it uses as much as digits as its factorization.

649904089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 649904089 is about 25493.2165291083. The cubic root of 649904089 is about 866.1964971637.

The spelling of 649904089 in words is "six hundred forty-nine million, nine hundred four thousand, eighty-nine".