520943391 has 12 divisors (see below), whose sum is σ = 765228360. Its totient is φ = 341408880.

The previous prime is 520943389. The next prime is 520943407. The reversal of 520943391 is 193349025.

It is a happy number.

520943391 is a `hidden beast` number, since 520 + 9 + 43 + 3 + 91 = 666.

It is not a de Polignac number, because 520943391 - 2¹ = 520943389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520943321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 490000 + ... + 491061.

It is an arithmetic number, because the mean of its divisors is an integer number (63769030).

Almost surely, 2^520943391 is an apocalyptic number.

520943391 is a deficient number, since it is larger than the sum of its proper divisors (244284969).

520943391 is a wasteful number, since it uses less digits than its factorization.

520943391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981126 (or 981123 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 520943391 is about 22824.1843446814. The cubic root of 520943391 is about 804.6311549181.

The spelling of 520943391 in words is "five hundred twenty million, nine hundred forty-three thousand, three hundred ninety-one".