649396837 has 2 divisors, whose sum is σ = 649396838. Its totient is φ = 649396836.

The previous prime is 649396829. The next prime is 649396841. The reversal of 649396837 is 738693946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621455041 + 27941796 = 24929^2 + 5286^2 .

It is a cyclic number.

It is not a de Polignac number, because 649396837 - 2³ = 649396829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649396817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324698418 + 324698419.

It is an arithmetic number, because the mean of its divisors is an integer number (324698419).

Almost surely, 2^649396837 is an apocalyptic number.

It is an amenable number.

649396837 is a deficient number, since it is larger than the sum of its proper divisors (1).

649396837 is an equidigital number, since it uses as much as digits as its factorization.

649396837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 55.

The square root of 649396837 is about 25483.2658228886. The cubic root of 649396837 is about 865.9710822268.

The spelling of 649396837 in words is "six hundred forty-nine million, three hundred ninety-six thousand, eight hundred thirty-seven".