813057972481 has 4 divisors (see below), whose sum is σ = 826386791764. Its totient is φ = 799729153200.

The previous prime is 813057972479. The next prime is 813057972491. The reversal of 813057972481 is 184279750318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184279750318 = 2 ⋅92139875159.

It can be written as a sum of positive squares in 2 ways, for example, as 228475396081 + 584582576400 = 477991^2 + 764580^2 .

It is a cyclic number.

It is not a de Polignac number, because 813057972481 - 2¹ = 813057972479 is a prime.

It is a super-2 number, since 2×813057972481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813057972431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6664409550 + ... + 6664409671.

It is an arithmetic number, because the mean of its divisors is an integer number (206596697941).

Almost surely, 2^813057972481 is an apocalyptic number.

It is an amenable number.

813057972481 is a deficient number, since it is larger than the sum of its proper divisors (13328819283).

813057972481 is a wasteful number, since it uses less digits than its factorization.

813057972481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13328819282.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 813057972481 in words is "eight hundred thirteen billion, fifty-seven million, nine hundred seventy-two thousand, four hundred eighty-one".