813138550839 has 12 divisors (see below), whose sum is σ = 1174823451672. Its totient is φ = 541958526000.

The previous prime is 813138550831. The next prime is 813138550849. The reversal of 813138550839 is 938055831318.

813138550839 is a `hidden beast` number, since 8 + 1 + 3 + 1 + 3 + 8 + 550 + 83 + 9 = 666.

It is not a de Polignac number, because 813138550839 - 2³ = 813138550831 is a prime.

It is a super-2 number, since 2×813138550839² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813138550831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11114952 + ... + 11187869.

It is an arithmetic number, because the mean of its divisors is an integer number (97901954306).

Almost surely, 2^813138550839 is an apocalyptic number.

813138550839 is a deficient number, since it is larger than the sum of its proper divisors (361684900833).

813138550839 is a wasteful number, since it uses less digits than its factorization.

813138550839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22306878 (or 22306875 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The spelling of 813138550839 in words is "eight hundred thirteen billion, one hundred thirty-eight million, five hundred fifty thousand, eight hundred thirty-nine".