649709573 has 2 divisors, whose sum is σ = 649709574. Its totient is φ = 649709572.

The previous prime is 649709539. The next prime is 649709581. The reversal of 649709573 is 375907946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 601573729 + 48135844 = 24527^2 + 6938^2 .

It is a cyclic number.

It is not a de Polignac number, because 649709573 - 2¹² = 649705477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649709173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324854786 + 324854787.

It is an arithmetic number, because the mean of its divisors is an integer number (324854787).

Almost surely, 2^649709573 is an apocalyptic number.

It is an amenable number.

649709573 is a deficient number, since it is larger than the sum of its proper divisors (1).

649709573 is an equidigital number, since it uses as much as digits as its factorization.

649709573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 50.

The square root of 649709573 is about 25489.4011895140. The cubic root of 649709573 is about 866.1100711340.

The spelling of 649709573 in words is "six hundred forty-nine million, seven hundred nine thousand, five hundred seventy-three".