649057973 has 2 divisors, whose sum is σ = 649057974. Its totient is φ = 649057972.

The previous prime is 649057889. The next prime is 649057987. The reversal of 649057973 is 379750946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639179524 + 9878449 = 25282^2 + 3143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649057973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649017973) 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, 324528986 + 324528987.

It is an arithmetic number, because the mean of its divisors is an integer number (324528987).

Almost surely, 2^649057973 is an apocalyptic number.

It is an amenable number.

649057973 is a deficient number, since it is larger than the sum of its proper divisors (1).

649057973 is an equidigital number, since it uses as much as digits as its factorization.

649057973 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 649057973 is about 25476.6161999587. The cubic root of 649057973 is about 865.8204309022.

The spelling of 649057973 in words is "six hundred forty-nine million, fifty-seven thousand, nine hundred seventy-three".