813605804047 has 2 divisors, whose sum is σ = 813605804048. Its totient is φ = 813605804046.

The previous prime is 813605803991. The next prime is 813605804149. The reversal of 813605804047 is 740408506318.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 813605804047 - 2³⁵ = 779246065679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 813605803988 and 813605804006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813605802047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406802902023 + 406802902024.

It is an arithmetic number, because the mean of its divisors is an integer number (406802902024).

Almost surely, 2^813605804047 is an apocalyptic number.

813605804047 is a deficient number, since it is larger than the sum of its proper divisors (1).

813605804047 is an equidigital number, since it uses as much as digits as its factorization.

813605804047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 46.

Subtracting from 813605804047 its sum of digits (46), we obtain a square (813605804001 = 902001²).

The spelling of 813605804047 in words is "eight hundred thirteen billion, six hundred five million, eight hundred four thousand, forty-seven".