813256124913 has 20 divisors (see below), whose sum is σ = 1215017882100. Its totient is φ = 542102114592.

The previous prime is 813256124897. The next prime is 813256124959. The reversal of 813256124913 is 319421652318.

813256124913 is a `hidden beast` number, since 8 + 1 + 3 + 25 + 612 + 4 + 9 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 273688015104 + 539568109809 = 523152^2 + 734553^2 .

It is not a de Polignac number, because 813256124913 - 2⁴ = 813256124897 is a prime.

It is a super-2 number, since 2×813256124913² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (813256124983) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12331 + ... + 1275407.

It is an arithmetic number, because the mean of its divisors is an integer number (60750894105).

Almost surely, 2^813256124913 is an apocalyptic number.

It is an amenable number.

813256124913 is a deficient number, since it is larger than the sum of its proper divisors (401761757187).

813256124913 is a wasteful number, since it uses less digits than its factorization.

813256124913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271038 (or 1271029 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 813256124913 in words is "eight hundred thirteen billion, two hundred fifty-six million, one hundred twenty-four thousand, nine hundred thirteen".