521728834113 has 6 divisors (see below), whose sum is σ = 753608315954. Its totient is φ = 347819222736.

The previous prime is 521728834111. The next prime is 521728834117. The reversal of 521728834113 is 311438827125.

521728834113 is a `hidden beast` number, since 5 + 2 + 17 + 288 + 341 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 415854737424 + 105874096689 = 644868^2 + 325383^2 .

It is not a de Polignac number, because 521728834113 - 2¹ = 521728834111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521728834111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28984935220 + ... + 28984935237.

Almost surely, 2^521728834113 is an apocalyptic number.

It is an amenable number.

521728834113 is a deficient number, since it is larger than the sum of its proper divisors (231879481841).

521728834113 is a wasteful number, since it uses less digits than its factorization.

521728834113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57969870463 (or 57969870460 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 521728834113 in words is "five hundred twenty-one billion, seven hundred twenty-eight million, eight hundred thirty-four thousand, one hundred thirteen".