813406108181 has 16 divisors (see below), whose sum is σ = 885995635200. Its totient is φ = 743809687488.

The previous prime is 813406108169. The next prime is 813406108183. The reversal of 813406108181 is 181801604318.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813406108181 is a prime.

It is a super-2 number, since 2×813406108181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813406108183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1727996 + ... + 2147738.

It is an arithmetic number, because the mean of its divisors is an integer number (55374727200).

Almost surely, 2^813406108181 is an apocalyptic number.

It is an amenable number.

813406108181 is a deficient number, since it is larger than the sum of its proper divisors (72589527019).

813406108181 is a wasteful number, since it uses less digits than its factorization.

813406108181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423308.

The product of its (nonzero) digits is 36864, while the sum is 41.

The spelling of 813406108181 in words is "eight hundred thirteen billion, four hundred six million, one hundred eight thousand, one hundred eighty-one".