813083499488521 has 16 divisors (see below), whose sum is σ = 830228565336768. Its totient is φ = 796005366811200.

The previous prime is 813083499488509. The next prime is 813083499488543. The reversal of 813083499488521 is 125884994380318.

It is a cyclic number.

It is not a de Polignac number, because 813083499488521 - 2²⁷ = 813083365270793 is a prime.

It is a super-2 number, since 2×813083499488521² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813083499428521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 702622531 + ... + 703778791.

It is an arithmetic number, because the mean of its divisors is an integer number (51889285333548).

Almost surely, 2^{813083499488521} is an apocalyptic number.

It is an amenable number.

813083499488521 is a deficient number, since it is larger than the sum of its proper divisors (17145065848247).

813083499488521 is a wasteful number, since it uses less digits than its factorization.

813083499488521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185192.

The product of its (nonzero) digits is 477757440, while the sum is 73.

The spelling of 813083499488521 in words is "eight hundred thirteen trillion, eighty-three billion, four hundred ninety-nine million, four hundred eighty-eight thousand, five hundred twenty-one".