520405171989 has 16 divisors (see below), whose sum is σ = 700603425600. Its totient is φ = 343585670400.

The previous prime is 520405171907. The next prime is 520405172017. The reversal of 520405171989 is 989171504025.

It is not a de Polignac number, because 520405171989 - 2¹⁶ = 520405106453 is a prime.

It is a super-2 number, since 2×520405171989² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520405171789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1576687 + ... + 1877964.

It is an arithmetic number, because the mean of its divisors is an integer number (43787714100).

Almost surely, 2^520405171989 is an apocalyptic number.

It is an amenable number.

520405171989 is a deficient number, since it is larger than the sum of its proper divisors (180198253611).

520405171989 is a wasteful number, since it uses less digits than its factorization.

520405171989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3455140.

The product of its (nonzero) digits is 907200, while the sum is 51.

The spelling of 520405171989 in words is "five hundred twenty billion, four hundred five million, one hundred seventy-one thousand, nine hundred eighty-nine".