520530245 has 8 divisors (see below), whose sum is σ = 641518584. Its totient is φ = 405169344.

The previous prime is 520530239. The next prime is 520530247. The reversal of 520530245 is 542035025.

It can be written as a sum of positive squares in 4 ways, for example, as 268927201 + 251603044 = 16399^2 + 15862^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520530245 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520530247) 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, 1406654 + ... + 1407023.

It is an arithmetic number, because the mean of its divisors is an integer number (80189823).

Almost surely, 2^520530245 is an apocalyptic number.

It is an amenable number.

520530245 is a deficient number, since it is larger than the sum of its proper divisors (120988339).

520530245 is a wasteful number, since it uses less digits than its factorization.

520530245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813719.

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

The square root of 520530245 is about 22815.1319303659. The cubic root of 520530245 is about 804.4183883181.

The spelling of 520530245 in words is "five hundred twenty million, five hundred thirty thousand, two hundred forty-five".