81319324043 has 2 divisors, whose sum is σ = 81319324044. Its totient is φ = 81319324042.

The previous prime is 81319324019. The next prime is 81319324049. The reversal of 81319324043 is 34042391318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81319324043 - 2¹² = 81319319947 is a prime.

It is a super-2 number, since 2×81319324043² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81319323988 and 81319324006.

It is not a weakly prime, because it can be changed into another prime (81319324049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40659662021 + 40659662022.

It is an arithmetic number, because the mean of its divisors is an integer number (40659662022).

Almost surely, 2^81319324043 is an apocalyptic number.

81319324043 is a deficient number, since it is larger than the sum of its proper divisors (1).

81319324043 is an equidigital number, since it uses as much as digits as its factorization.

81319324043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 81319324043 in words is "eighty-one billion, three hundred nineteen million, three hundred twenty-four thousand, forty-three".