649133839 has 2 divisors, whose sum is σ = 649133840. Its totient is φ = 649133838.

The previous prime is 649133833. The next prime is 649133861. The reversal of 649133839 is 938331946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649133839 - 2⁹ = 649133327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649133833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324566919 + 324566920.

It is an arithmetic number, because the mean of its divisors is an integer number (324566920).

Almost surely, 2^649133839 is an apocalyptic number.

649133839 is a deficient number, since it is larger than the sum of its proper divisors (1).

649133839 is an equidigital number, since it uses as much as digits as its factorization.

649133839 is an evil number, because the sum of its binary digits is even.

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

The square root of 649133839 is about 25478.1050904497. The cubic root of 649133839 is about 865.8541637769.

The spelling of 649133839 in words is "six hundred forty-nine million, one hundred thirty-three thousand, eight hundred thirty-nine".