520840815957331 has 4 divisors (see below), whose sum is σ = 520842970864512. Its totient is φ = 520838661050152.

The previous prime is 520840815957323. The next prime is 520840815957337. The reversal of 520840815957331 is 133759518048025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520840815957331 - 2³ = 520840815957323 is a prime.

It is a super-2 number, since 2×520840815957331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520840815957331.

It is not an unprimeable number, because it can be changed into a prime (520840815957337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077091000 + ... + 1077574453.

It is an arithmetic number, because the mean of its divisors is an integer number (130210742716128).

Almost surely, 2^{520840815957331} is an apocalyptic number.

520840815957331 is a deficient number, since it is larger than the sum of its proper divisors (2154907181).

520840815957331 is a wasteful number, since it uses less digits than its factorization.

520840815957331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154907180.

The product of its (nonzero) digits is 36288000, while the sum is 61.

The spelling of 520840815957331 in words is "five hundred twenty trillion, eight hundred forty billion, eight hundred fifteen million, nine hundred fifty-seven thousand, three hundred thirty-one".