520169 has 4 divisors (see below), whose sum is σ = 560196. Its totient is φ = 480144.

The previous prime is 520151. The next prime is 520193. The reversal of 520169 is 961025.

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 144400 + 375769 = 380^2 + 613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520169 is a prime.

It is a super-2 number, since 2×520169² = 541151577122, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520129) 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, 19994 + ... + 20019.

It is an arithmetic number, because the mean of its divisors is an integer number (140049).

2⁵²⁰¹⁶⁹ is an apocalyptic number.

It is an amenable number.

520169 is a deficient number, since it is larger than the sum of its proper divisors (40027).

520169 is a wasteful number, since it uses less digits than its factorization.

520169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40026.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 520169 is about 721.2274259899. The cubic root of 520169 is about 80.4232258007.

It can be divided in two parts, 52016 and 9, that added together give a palindrome (52025).

The spelling of 520169 in words is "five hundred twenty thousand, one hundred sixty-nine".