811197395431 has 4 divisors (see below), whose sum is σ = 811533854664. Its totient is φ = 810860936200.

The previous prime is 811197395381. The next prime is 811197395461. The reversal of 811197395431 is 134593791118.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 811197395431 - 2¹⁵ = 811197362663 is a prime.

It is a super-2 number, since 2×811197395431² (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 (811197395461) 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, 168226000 + ... + 168230821.

It is an arithmetic number, because the mean of its divisors is an integer number (202883463666).

Almost surely, 2^811197395431 is an apocalyptic number.

811197395431 is a deficient number, since it is larger than the sum of its proper divisors (336459233).

811197395431 is a wasteful number, since it uses less digits than its factorization.

811197395431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336459232.

The product of its digits is 816480, while the sum is 52.

The spelling of 811197395431 in words is "eight hundred eleven billion, one hundred ninety-seven million, three hundred ninety-five thousand, four hundred thirty-one".