649648093 has 2 divisors, whose sum is σ = 649648094. Its totient is φ = 649648092.

The previous prime is 649648079. The next prime is 649648163. The reversal of 649648093 is 390846946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517926564 + 131721529 = 22758^2 + 11477^2 .

It is a cyclic number.

It is not a de Polignac number, because 649648093 - 2²¹ = 647550941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649648003) 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, 324824046 + 324824047.

It is an arithmetic number, because the mean of its divisors is an integer number (324824047).

Almost surely, 2^649648093 is an apocalyptic number.

It is an amenable number.

649648093 is a deficient number, since it is larger than the sum of its proper divisors (1).

649648093 is an equidigital number, since it uses as much as digits as its factorization.

649648093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 649648093 is about 25488.1951695290. The cubic root of 649648093 is about 866.0827511698.

The spelling of 649648093 in words is "six hundred forty-nine million, six hundred forty-eight thousand, ninety-three".