520165 has 4 divisors (see below), whose sum is σ = 624204. Its totient is φ = 416128.

The previous prime is 520151. The next prime is 520193. The reversal of 520165 is 561025.

It is a happy number.

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 199809 + 320356 = 447^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 520165 - 2¹⁵ = 487397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52012 + ... + 52021.

It is an arithmetic number, because the mean of its divisors is an integer number (156051).

2⁵²⁰¹⁶⁵ is an apocalyptic number.

It is an amenable number.

520165 is a deficient number, since it is larger than the sum of its proper divisors (104039).

520165 is a wasteful number, since it uses less digits than its factorization.

520165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104038.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 520165 is about 721.2246529342. The cubic root of 520165 is about 80.4230196537.

The spelling of 520165 in words is "five hundred twenty thousand, one hundred sixty-five".