649843319 has 2 divisors, whose sum is σ = 649843320. Its totient is φ = 649843318.

The previous prime is 649843307. The next prime is 649843361. The reversal of 649843319 is 913348946.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649843319 - 2⁴ = 649843303 is a prime.

It is a super-2 number, since 2×649843319² = 844592678497871522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649833319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324921659 + 324921660.

It is an arithmetic number, because the mean of its divisors is an integer number (324921660).

Almost surely, 2^649843319 is an apocalyptic number.

649843319 is a deficient number, since it is larger than the sum of its proper divisors (1).

649843319 is an equidigital number, since it uses as much as digits as its factorization.

649843319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 47.

The square root of 649843319 is about 25492.0246155538. The cubic root of 649843319 is about 866.1694981019.

The spelling of 649843319 in words is "six hundred forty-nine million, eight hundred forty-three thousand, three hundred nineteen".