520008505 has 4 divisors (see below), whose sum is σ = 624010212. Its totient is φ = 416006800.

The previous prime is 520008491. The next prime is 520008509. The reversal of 520008505 is 505800025.

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 320266816 + 199741689 = 17896^2 + 14133^2 .

It is not a de Polignac number, because 520008505 - 2¹¹ = 520006457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520008505.

It is not an unprimeable number, because it can be changed into a prime (520008509) 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, 52000846 + ... + 52000855.

It is an arithmetic number, because the mean of its divisors is an integer number (156002553).

Almost surely, 2^520008505 is an apocalyptic number.

It is an amenable number.

520008505 is a deficient number, since it is larger than the sum of its proper divisors (104001707).

520008505 is a wasteful number, since it uses less digits than its factorization.

520008505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104001706.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 520008505 is about 22803.6949856816. The cubic root of 520008505 is about 804.1495358314.

The spelling of 520008505 in words is "five hundred twenty million, eight thousand, five hundred five".