520523345 has 8 divisors (see below), whose sum is σ = 625305960. Its totient is φ = 415966720.

The previous prime is 520523329. The next prime is 520523347. The reversal of 520523345 is 543325025.

It can be written as a sum of positive squares in 4 ways, for example, as 29767936 + 490755409 = 5456^2 + 22153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520523345 - 2⁴ = 520523329 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520523347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51386 + ... + 60675.

It is an arithmetic number, because the mean of its divisors is an integer number (78163245).

Almost surely, 2^520523345 is an apocalyptic number.

It is an amenable number.

520523345 is a deficient number, since it is larger than the sum of its proper divisors (104782615).

520523345 is a wasteful number, since it uses less digits than its factorization.

520523345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112995.

The product of its (nonzero) digits is 18000, while the sum is 29.

The square root of 520523345 is about 22814.9807144341. The cubic root of 520523345 is about 804.4148339224.

The spelling of 520523345 in words is "five hundred twenty million, five hundred twenty-three thousand, three hundred forty-five".