520109 has 4 divisors (see below), whose sum is σ = 534204. Its totient is φ = 506016.

The previous prime is 520103. The next prime is 520111. The reversal of 520109 is 901025.

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

It can be written as a sum of positive squares in 2 ways, for example, as 220900 + 299209 = 470^2 + 547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520103) 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, 6992 + ... + 7065.

It is an arithmetic number, because the mean of its divisors is an integer number (133551).

2⁵²⁰¹⁰⁹ is an apocalyptic number.

It is an amenable number.

520109 is a deficient number, since it is larger than the sum of its proper divisors (14095).

520109 is a wasteful number, since it uses less digits than its factorization.

520109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14094.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 520109 is about 721.1858290344. The cubic root of 520109 is about 80.4201334857.

The spelling of 520109 in words is "five hundred twenty thousand, one hundred nine".