520766257 has 4 divisors (see below), whose sum is σ = 568108656. Its totient is φ = 473423860.

The previous prime is 520766243. The next prime is 520766317. The reversal of 520766257 is 752667025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520766257 - 2²⁷ = 386548529 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520766227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23671183 + ... + 23671204.

It is an arithmetic number, because the mean of its divisors is an integer number (142027164).

Almost surely, 2^520766257 is an apocalyptic number.

It is an amenable number.

520766257 is a deficient number, since it is larger than the sum of its proper divisors (47342399).

520766257 is a wasteful number, since it uses less digits than its factorization.

520766257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47342398.

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 520766257 is about 22820.3036132300. The cubic root of 520766257 is about 804.5399462284.

The spelling of 520766257 in words is "five hundred twenty million, seven hundred sixty-six thousand, two hundred fifty-seven".