813529207922 has 6 divisors (see below), whose sum is σ = 1220295725229. Its totient is φ = 406763966180.

The previous prime is 813529207891. The next prime is 813529207951. The reversal of 813529207922 is 229702925318.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 620315335201 + 193213872721 = 787601^2 + 439561^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=637781.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 956672 + ... + 1594452.

Almost surely, 2^813529207922 is an apocalyptic number.

813529207922 is a deficient number, since it is larger than the sum of its proper divisors (406766517307).

813529207922 is an frugal number, since it uses more digits than its factorization.

813529207922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275564 (or 637783 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

Multiplying 813529207922 by its sum of digits (50), we get a square (40676460396100 = 6377810²).

The spelling of 813529207922 in words is "eight hundred thirteen billion, five hundred twenty-nine million, two hundred seven thousand, nine hundred twenty-two".