649238329 has 2 divisors, whose sum is σ = 649238330. Its totient is φ = 649238328.

The previous prime is 649238327. The next prime is 649238333. The reversal of 649238329 is 923832946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 365383225 + 283855104 = 19115^2 + 16848^2 .

It is a cyclic number.

It is not a de Polignac number, because 649238329 - 2¹ = 649238327 is a prime.

Together with 649238327, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (649238323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324619164 + 324619165.

It is an arithmetic number, because the mean of its divisors is an integer number (324619165).

Almost surely, 2^649238329 is an apocalyptic number.

It is an amenable number.

649238329 is a deficient number, since it is larger than the sum of its proper divisors (1).

649238329 is an equidigital number, since it uses as much as digits as its factorization.

649238329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 46.

The square root of 649238329 is about 25480.1555921466. The cubic root of 649238329 is about 865.9006196550.

The spelling of 649238329 in words is "six hundred forty-nine million, two hundred thirty-eight thousand, three hundred twenty-nine".