520306891 has 12 divisors (see below), whose sum is σ = 567168240. Its totient is φ = 477079200.

The previous prime is 520306889. The next prime is 520306901. The reversal of 520306891 is 198603025.

It is not a de Polignac number, because 520306891 - 2¹ = 520306889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520306841) 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 11 ways as a sum of consecutive naturals, for example, 15325 + ... + 35713.

It is an arithmetic number, because the mean of its divisors is an integer number (47264020).

Almost surely, 2^520306891 is an apocalyptic number.

520306891 is a deficient number, since it is larger than the sum of its proper divisors (46861349).

520306891 is a wasteful number, since it uses less digits than its factorization.

520306891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20566 (or 20553 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 520306891 is about 22810.2365397643. The cubic root of 520306891 is about 804.3033160620.

The spelling of 520306891 in words is "five hundred twenty million, three hundred six thousand, eight hundred ninety-one".