520915 has 4 divisors (see below), whose sum is σ = 625104. Its totient is φ = 416728.

The previous prime is 520913. The next prime is 520921. The reversal of 520915 is 519025.

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 520915 - 2¹ = 520913 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

520915 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (520913) 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 3 ways as a sum of consecutive naturals, for example, 52087 + ... + 52096.

It is an arithmetic number, because the mean of its divisors is an integer number (156276).

2⁵²⁰⁹¹⁵ is an apocalyptic number.

520915 is a deficient number, since it is larger than the sum of its proper divisors (104189).

520915 is a wasteful number, since it uses less digits than its factorization.

520915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104188.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 520915 is about 721.7444145956. The cubic root of 520915 is about 80.4616537400.

It can be divided in two parts, 520 and 915, that multiplied together give a triangular number (475800 = T₉₇₅).

The spelling of 520915 in words is "five hundred twenty thousand, nine hundred fifteen".