813252307181 has 4 divisors (see below), whose sum is σ = 813293527200. Its totient is φ = 813211087164.

The previous prime is 813252307163. The next prime is 813252307201. The reversal of 813252307181 is 181703252318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 813252307181 - 2⁶ = 813252307117 is a prime.

It is a super-2 number, since 2×813252307181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813252301181) 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, 20580401 + ... + 20619878.

It is an arithmetic number, because the mean of its divisors is an integer number (203323381800).

Almost surely, 2^813252307181 is an apocalyptic number.

It is an amenable number.

813252307181 is a deficient number, since it is larger than the sum of its proper divisors (41220019).

813252307181 is a wasteful number, since it uses less digits than its factorization.

813252307181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41220018.

The product of its (nonzero) digits is 80640, while the sum is 41.

Adding to 813252307181 its reverse (181703252318), we get a palindrome (994955559499).

The spelling of 813252307181 in words is "eight hundred thirteen billion, two hundred fifty-two million, three hundred seven thousand, one hundred eighty-one".