811447023117 has 4 divisors (see below), whose sum is σ = 1081929364160. Its totient is φ = 540964682076.

The previous prime is 811447023109. The next prime is 811447023193. The reversal of 811447023117 is 711320744118.

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 not a de Polignac number, because 811447023117 - 2³ = 811447023109 is a prime.

It is a super-2 number, since 2×811447023117² (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 (811447003117) 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, 135241170517 + ... + 135241170522.

It is an arithmetic number, because the mean of its divisors is an integer number (270482341040).

Almost surely, 2^811447023117 is an apocalyptic number.

It is an amenable number.

811447023117 is a deficient number, since it is larger than the sum of its proper divisors (270482341043).

811447023117 is a wasteful number, since it uses less digits than its factorization.

811447023117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270482341042.

The product of its (nonzero) digits is 37632, while the sum is 39.

The spelling of 811447023117 in words is "eight hundred eleven billion, four hundred forty-seven million, twenty-three thousand, one hundred seventeen".