520099 has 4 divisors (see below), whose sum is σ = 542736. Its totient is φ = 497464.

The previous prime is 520073. The next prime is 520103. The reversal of 520099 is 990025.

520099 = 83² + 84² + ... + 128².

520099 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520099 - 2⁵ = 520067 is a prime.

It is a Duffinian number.

520099 is a modest number, since divided by 99 gives 52 as remainder.

520099 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11284 + ... + 11329.

It is an arithmetic number, because the mean of its divisors is an integer number (135684).

2⁵²⁰⁰⁹⁹ is an apocalyptic number.

520099 is a deficient number, since it is larger than the sum of its proper divisors (22637).

520099 is a wasteful number, since it uses less digits than its factorization.

520099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22636.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 520099 is about 721.1788959752. The cubic root of 520099 is about 80.4196180768.

The spelling of 520099 in words is "five hundred twenty thousand, ninety-nine".