81031103999 has 2 divisors, whose sum is σ = 81031104000. Its totient is φ = 81031103998.

The previous prime is 81031103981. The next prime is 81031104013. The reversal of 81031103999 is 99930113018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81031103999 - 2²⁸ = 80762668543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81031103929) 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, 40515551999 + 40515552000.

It is an arithmetic number, because the mean of its divisors is an integer number (40515552000).

Almost surely, 2^81031103999 is an apocalyptic number.

81031103999 is a deficient number, since it is larger than the sum of its proper divisors (1).

81031103999 is an equidigital number, since it uses as much as digits as its factorization.

81031103999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 81031103999 in words is "eighty-one billion, thirty-one million, one hundred three thousand, nine hundred ninety-nine".