520609 has 2 divisors, whose sum is σ = 520610. Its totient is φ = 520608.

The previous prime is 520607. The next prime is 520621. The reversal of 520609 is 906025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 2209 = 720^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 520609 - 2¹ = 520607 is a prime.

Together with 520607, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 520609.

It is not a weakly prime, because it can be changed into another prime (520607) 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, 260304 + 260305.

It is an arithmetic number, because the mean of its divisors is an integer number (260305).

2⁵²⁰⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

520609 is a deficient number, since it is larger than the sum of its proper divisors (1).

520609 is an equidigital number, since it uses as much as digits as its factorization.

520609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 520609 is about 721.5323970550. The cubic root of 520609 is about 80.4458955141.

The spelling of 520609 in words is "five hundred twenty thousand, six hundred nine".