520163391 has 12 divisors (see below), whose sum is σ = 762333656. Its totient is φ = 315250320.

The previous prime is 520163387. The next prime is 520163419. The reversal of 520163391 is 193361025.

It is not a de Polignac number, because 520163391 - 2² = 520163387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520163191) 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, 716116 + ... + 716841.

Almost surely, 2^520163391 is an apocalyptic number.

520163391 is a deficient number, since it is larger than the sum of its proper divisors (242170265).

520163391 is a wasteful number, since it uses less digits than its factorization.

520163391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432982 (or 1432971 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 520163391 is about 22807.0908052737. The cubic root of 520163391 is about 804.2293673084.

The spelling of 520163391 in words is "five hundred twenty million, one hundred sixty-three thousand, three hundred ninety-one".