81083227231 has 2 divisors, whose sum is σ = 81083227232. Its totient is φ = 81083227230.

The previous prime is 81083227229. The next prime is 81083227259. The reversal of 81083227231 is 13272238018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81083227231 - 2¹ = 81083227229 is a prime.

It is a super-2 number, since 2×81083227231² (a number of 23 digits) contains 22 as substring.

Together with 81083227229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81083267231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40541613615 + 40541613616.

It is an arithmetic number, because the mean of its divisors is an integer number (40541613616).

Almost surely, 2^81083227231 is an apocalyptic number.

81083227231 is a deficient number, since it is larger than the sum of its proper divisors (1).

81083227231 is an equidigital number, since it uses as much as digits as its factorization.

81083227231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 81083227231 in words is "eighty-one billion, eighty-three million, two hundred twenty-seven thousand, two hundred thirty-one".