648199837 has 2 divisors, whose sum is σ = 648199838. Its totient is φ = 648199836.

The previous prime is 648199829. The next prime is 648199859. The reversal of 648199837 is 738991846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458559396 + 189640441 = 21414^2 + 13771^2 .

It is a cyclic number.

It is not a de Polignac number, because 648199837 - 2³ = 648199829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648199037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324099918 + 324099919.

It is an arithmetic number, because the mean of its divisors is an integer number (324099919).

Almost surely, 2^648199837 is an apocalyptic number.

It is an amenable number.

648199837 is a deficient number, since it is larger than the sum of its proper divisors (1).

648199837 is an equidigital number, since it uses as much as digits as its factorization.

648199837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 55.

The square root of 648199837 is about 25459.7689895254. The cubic root of 648199837 is about 865.4386882353.

The spelling of 648199837 in words is "six hundred forty-eight million, one hundred ninety-nine thousand, eight hundred thirty-seven".