659521 has 2 divisors, whose sum is σ = 659522. Its totient is φ = 659520.

The previous prime is 659513. The next prime is 659531. The reversal of 659521 is 125956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404496 + 255025 = 636^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 659521 - 2³ = 659513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 659521.

It is not a weakly prime, because it can be changed into another prime (659501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329760 + 329761.

It is an arithmetic number, because the mean of its divisors is an integer number (329761).

2⁶⁵⁹⁵²¹ is an apocalyptic number.

It is an amenable number.

659521 is a deficient number, since it is larger than the sum of its proper divisors (1).

659521 is an equidigital number, since it uses as much as digits as its factorization.

659521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 28.

The square root of 659521 is about 812.1089828342. The cubic root of 659521 is about 87.0448089076.

The spelling of 659521 in words is "six hundred fifty-nine thousand, five hundred twenty-one".