649234909 has 2 divisors, whose sum is σ = 649234910. Its totient is φ = 649234908.

The previous prime is 649234907. The next prime is 649234933. The reversal of 649234909 is 909432946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 605012409 + 44222500 = 24597^2 + 6650^2 .

It is a cyclic number.

It is not a de Polignac number, because 649234909 - 2¹ = 649234907 is a prime.

Together with 649234907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649234903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324617454 + 324617455.

It is an arithmetic number, because the mean of its divisors is an integer number (324617455).

Almost surely, 2^649234909 is an apocalyptic number.

It is an amenable number.

649234909 is a deficient number, since it is larger than the sum of its proper divisors (1).

649234909 is an equidigital number, since it uses as much as digits as its factorization.

649234909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 649234909 is about 25480.0884810081. The cubic root of 649234909 is about 865.8990992142.

The spelling of 649234909 in words is "six hundred forty-nine million, two hundred thirty-four thousand, nine hundred nine".