649722329 has 2 divisors, whose sum is σ = 649722330. Its totient is φ = 649722328.

The previous prime is 649722289. The next prime is 649722373. The reversal of 649722329 is 923227946.

It is an a-pointer prime, because the next prime (649722373) can be obtained adding 649722329 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481890304 + 167832025 = 21952^2 + 12955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649722329 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 649722329.

It is not a weakly prime, because it can be changed into another prime (649022329) 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, 324861164 + 324861165.

It is an arithmetic number, because the mean of its divisors is an integer number (324861165).

Almost surely, 2^649722329 is an apocalyptic number.

It is an amenable number.

649722329 is a deficient number, since it is larger than the sum of its proper divisors (1).

649722329 is an equidigital number, since it uses as much as digits as its factorization.

649722329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 44.

The square root of 649722329 is about 25489.6514099350. The cubic root of 649722329 is about 866.1157393219.

The spelling of 649722329 in words is "six hundred forty-nine million, seven hundred twenty-two thousand, three hundred twenty-nine".