520591 has 8 divisors (see below), whose sum is σ = 558144. Its totient is φ = 483840.

The previous prime is 520589. The next prime is 520607. The reversal of 520591 is 195025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 9-Lehmer number, since φ(520591) divides (520591-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 520591 - 2¹ = 520589 is a prime.

520591 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1786 + ... + 2056.

It is an arithmetic number, because the mean of its divisors is an integer number (69768).

2⁵²⁰⁵⁹¹ is an apocalyptic number.

520591 is a deficient number, since it is larger than the sum of its proper divisors (37553).

520591 is a wasteful number, since it uses less digits than its factorization.

520591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 520591 is about 721.5199234948. The cubic root of 520591 is about 80.4449683674. Note that the first 3 decimals are identical.

It can be divided in two parts, 520 and 591, that added together give a palindrome (1111).

The spelling of 520591 in words is "five hundred twenty thousand, five hundred ninety-one".