81033509111 has 2 divisors, whose sum is σ = 81033509112. Its totient is φ = 81033509110.

The previous prime is 81033509093. The next prime is 81033509143. The reversal of 81033509111 is 11190533018.

It is a happy number.

It is an a-pointer prime, because the next prime (81033509143) can be obtained adding 81033509111 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81033509111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81033502111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40516754555 + 40516754556.

It is an arithmetic number, because the mean of its divisors is an integer number (40516754556).

Almost surely, 2^81033509111 is an apocalyptic number.

81033509111 is a deficient number, since it is larger than the sum of its proper divisors (1).

81033509111 is an equidigital number, since it uses as much as digits as its factorization.

81033509111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The spelling of 81033509111 in words is "eighty-one billion, thirty-three million, five hundred nine thousand, one hundred eleven".