521523442111 has 4 divisors (see below), whose sum is σ = 596026790992. Its totient is φ = 447020093232.

The previous prime is 521523442087. The next prime is 521523442151. The reversal of 521523442111 is 111244325125.

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 521523442111 - 2⁵ = 521523442079 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 (521523442151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37251674430 + ... + 37251674443.

It is an arithmetic number, because the mean of its divisors is an integer number (149006697748).

Almost surely, 2^521523442111 is an apocalyptic number.

521523442111 is a deficient number, since it is larger than the sum of its proper divisors (74503348881).

521523442111 is an equidigital number, since it uses as much as digits as its factorization.

521523442111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74503348880.

The product of its digits is 9600, while the sum is 31.

Adding to 521523442111 its reverse (111244325125), we get a palindrome (632767767236).

The spelling of 521523442111 in words is "five hundred twenty-one billion, five hundred twenty-three million, four hundred forty-two thousand, one hundred eleven".