649297729 has 2 divisors, whose sum is σ = 649297730. Its totient is φ = 649297728.

The previous prime is 649297717. The next prime is 649297739. The reversal of 649297729 is 927792946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599270400 + 50027329 = 24480^2 + 7073^2 .

It is a cyclic number.

It is not a de Polignac number, because 649297729 - 2⁷ = 649297601 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649297729.

It is not a weakly prime, because it can be changed into another prime (649297739) 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, 324648864 + 324648865.

It is an arithmetic number, because the mean of its divisors is an integer number (324648865).

Almost surely, 2^649297729 is an apocalyptic number.

It is an amenable number.

649297729 is a deficient number, since it is larger than the sum of its proper divisors (1).

649297729 is an equidigital number, since it uses as much as digits as its factorization.

649297729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 55.

The square root of 649297729 is about 25481.3211784633. The cubic root of 649297729 is about 865.9270264592.

It can be divided in two parts, 649 and 297729, that added together give a triangular number (298378 = T₇₇₂).

The spelling of 649297729 in words is "six hundred forty-nine million, two hundred ninety-seven thousand, seven hundred twenty-nine".