520999 has 8 divisors (see below), whose sum is σ = 581040. Its totient is φ = 464256.

The previous prime is 520981. The next prime is 521009. The reversal of 520999 is 999025.

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

It is a cyclic number.

It is not a de Polignac number, because 520999 - 2⁵ = 520967 is a prime.

It is a Duffinian number.

520999 is a modest number, since divided by 999 gives 520 as remainder.

520999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520969) 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, 484 + ... + 1129.

It is an arithmetic number, because the mean of its divisors is an integer number (72630).

2⁵²⁰⁹⁹⁹ is an apocalyptic number.

520999 is a deficient number, since it is larger than the sum of its proper divisors (60041).

520999 is a wasteful number, since it uses less digits than its factorization.

520999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 520999 is about 721.8026045949. The cubic root of 520999 is about 80.4659784479.

The spelling of 520999 in words is "five hundred twenty thousand, nine hundred ninety-nine".