591649 has 2 divisors, whose sum is σ = 591650. Its totient is φ = 591648.

The previous prime is 591623. The next prime is 591653. The reversal of 591649 is 946195.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431649 + 160000 = 657^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 591649 - 2⁹ = 591137 is a prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (591659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 295824 + 295825.

It is an arithmetic number, because the mean of its divisors is an integer number (295825).

2⁵⁹¹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

591649 is a deficient number, since it is larger than the sum of its proper divisors (1).

591649 is an equidigital number, since it uses as much as digits as its factorization.

591649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 591649 is about 769.1872333834. The cubic root of 591649 is about 83.9501310195.

The spelling of 591649 in words is "five hundred ninety-one thousand, six hundred forty-nine".