520523405 has 4 divisors (see below), whose sum is σ = 624628092. Its totient is φ = 416418720.

The previous prime is 520523401. The next prime is 520523453. The reversal of 520523405 is 504325025.

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 224580196 + 295943209 = 14986^2 + 17203^2 .

It is not a de Polignac number, because 520523405 - 2² = 520523401 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 (520523401) 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, 52052336 + ... + 52052345.

It is an arithmetic number, because the mean of its divisors is an integer number (156157023).

Almost surely, 2^520523405 is an apocalyptic number.

It is an amenable number.

520523405 is a deficient number, since it is larger than the sum of its proper divisors (104104687).

520523405 is a wasteful number, since it uses less digits than its factorization.

520523405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104104686.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 520523405 is about 22814.9820293596. The cubic root of 520523405 is about 804.4148648303.

The spelling of 520523405 in words is "five hundred twenty million, five hundred twenty-three thousand, four hundred five".