81043529111 has 2 divisors, whose sum is σ = 81043529112. Its totient is φ = 81043529110.

The previous prime is 81043529093. The next prime is 81043529113. The reversal of 81043529111 is 11192534018.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81043529111 is a prime.

It is a super-2 number, since 2×81043529111² (a number of 23 digits) contains 22 as substring.

Together with 81043529113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81043529113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40521764555 + 40521764556.

It is an arithmetic number, because the mean of its divisors is an integer number (40521764556).

Almost surely, 2^81043529111 is an apocalyptic number.

81043529111 is a deficient number, since it is larger than the sum of its proper divisors (1).

81043529111 is an equidigital number, since it uses as much as digits as its factorization.

81043529111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 81043529111 in words is "eighty-one billion, forty-three million, five hundred twenty-nine thousand, one hundred eleven".