649573 has 2 divisors, whose sum is σ = 649574. Its totient is φ = 649572.

The previous prime is 649567. The next prime is 649577. The reversal of 649573 is 375946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636804 + 12769 = 798^2 + 113^2 .

It is a cyclic number.

It is not a de Polignac number, because 649573 - 2⁵ = 649541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324786 + 324787.

It is an arithmetic number, because the mean of its divisors is an integer number (324787).

2⁶⁴⁹⁵⁷³ is an apocalyptic number.

It is an amenable number.

649573 is a deficient number, since it is larger than the sum of its proper divisors (1).

649573 is an equidigital number, since it uses as much as digits as its factorization.

649573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 649573 is about 805.9609171666. The cubic root of 649573 is about 86.6049379637.

The spelling of 649573 in words is "six hundred forty-nine thousand, five hundred seventy-three".