520173109 has 4 divisors (see below), whose sum is σ = 532860300. Its totient is φ = 507485920.

The previous prime is 520173079. The next prime is 520173133. The reversal of 520173109 is 901371025.

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 202977009 + 317196100 = 14247^2 + 17810^2 .

It is a cyclic number.

It is not a de Polignac number, because 520173109 - 2¹¹ = 520171061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520173139) 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, 6343534 + ... + 6343615.

It is an arithmetic number, because the mean of its divisors is an integer number (133215075).

Almost surely, 2^520173109 is an apocalyptic number.

It is an amenable number.

520173109 is a deficient number, since it is larger than the sum of its proper divisors (12687191).

520173109 is a wasteful number, since it uses less digits than its factorization.

520173109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12687190.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 520173109 is about 22807.3038520558. The cubic root of 520173109 is about 804.2343756401.

The spelling of 520173109 in words is "five hundred twenty million, one hundred seventy-three thousand, one hundred nine".