813674357521 has 3 divisors (see below), whose sum is σ = 813675259561. Its totient is φ = 813673455482.

The previous prime is 813674357497. The next prime is 813674357527. The reversal of 813674357521 is 125753476318.

The square root of 813674357521 is 902039.

It is a perfect power (a square), and thus also a powerful number.

813674357521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 813674357521 - 2⁹ = 813674357009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813674357527) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 451020 + ... + 1353058.

Almost surely, 2^813674357521 is an apocalyptic number.

813674357521 is the 902039-th square number.

813674357521 is the 451020-th centered octagonal number.

It is an amenable number.

813674357521 is a deficient number, since it is larger than the sum of its proper divisors (902040).

813674357521 is an frugal number, since it uses more digits than its factorization.

813674357521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804078 (or 902039 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 52.

The spelling of 813674357521 in words is "eight hundred thirteen billion, six hundred seventy-four million, three hundred fifty-seven thousand, five hundred twenty-one".