813243507122 has 6 divisors (see below), whose sum is σ = 1219867173693. Its totient is φ = 406621115892.

The previous prime is 813243507091. The next prime is 813243507179. The reversal of 813243507122 is 221705342318.

813243507122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 813241436401 + 2070721 = 901799^2 + 1439^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=637669.

It is a super-2 number, since 2×813243507122² (a number of 25 digits) contains 22 as substring.

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, 956504 + ... + 1594172.

Almost surely, 2^813243507122 is an apocalyptic number.

813243507122 is a deficient number, since it is larger than the sum of its proper divisors (406623666571).

813243507122 is an frugal number, since it uses more digits than its factorization.

813243507122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275340 (or 637671 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 813243507122 in words is "eight hundred thirteen billion, two hundred forty-three million, five hundred seven thousand, one hundred twenty-two".