648448993 has 2 divisors, whose sum is σ = 648448994. Its totient is φ = 648448992.

The previous prime is 648448991. The next prime is 648449017. The reversal of 648448993 is 399844846.

It is a happy number.

648448993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386397649 + 262051344 = 19657^2 + 16188^2 .

It is a cyclic number.

It is not a de Polignac number, because 648448993 - 2¹ = 648448991 is a prime.

Together with 648448991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (648448991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324224496 + 324224497.

It is an arithmetic number, because the mean of its divisors is an integer number (324224497).

Almost surely, 2^648448993 is an apocalyptic number.

It is an amenable number.

648448993 is a deficient number, since it is larger than the sum of its proper divisors (1).

648448993 is an equidigital number, since it uses as much as digits as its factorization.

648448993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 55.

The square root of 648448993 is about 25464.6616510018. The cubic root of 648448993 is about 865.5495602265.

It can be divided in two parts, 64844 and 8993, that added together give a palindrome (73837).

The spelling of 648448993 in words is "six hundred forty-eight million, four hundred forty-eight thousand, nine hundred ninety-three".