649867717 has 2 divisors, whose sum is σ = 649867718. Its totient is φ = 649867716.

The previous prime is 649867711. The next prime is 649867727. The reversal of 649867717 is 717768946.

649867717 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., 643180321 + 6687396 = 25361^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 649867717 - 2¹⁵ = 649834949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649867711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324933858 + 324933859.

It is an arithmetic number, because the mean of its divisors is an integer number (324933859).

Almost surely, 2^649867717 is an apocalyptic number.

It is an amenable number.

649867717 is a deficient number, since it is larger than the sum of its proper divisors (1).

649867717 is an equidigital number, since it uses as much as digits as its factorization.

649867717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 55.

The square root of 649867717 is about 25492.5031528879. The cubic root of 649867717 is about 866.1803379143.

The spelling of 649867717 in words is "six hundred forty-nine million, eight hundred sixty-seven thousand, seven hundred seventeen".