649297717 has 2 divisors, whose sum is σ = 649297718. Its totient is φ = 649297716.

The previous prime is 649297699. The next prime is 649297729. The reversal of 649297717 is 717792946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630712996 + 18584721 = 25114^2 + 4311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649297717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649297757) 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, 324648858 + 324648859.

It is an arithmetic number, because the mean of its divisors is an integer number (324648859).

Almost surely, 2^649297717 is an apocalyptic number.

It is an amenable number.

649297717 is a deficient number, since it is larger than the sum of its proper divisors (1).

649297717 is an equidigital number, since it uses as much as digits as its factorization.

649297717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 52.

The square root of 649297717 is about 25481.3209429967. The cubic root of 649297717 is about 865.9270211246.

The spelling of 649297717 in words is "six hundred forty-nine million, two hundred ninety-seven thousand, seven hundred seventeen".