81884911 has 2 divisors, whose sum is σ = 81884912. Its totient is φ = 81884910.

The previous prime is 81884863. The next prime is 81884917. The reversal of 81884911 is 11948818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81884911 - 2⁹ = 81884399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81884917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40942455 + 40942456.

It is an arithmetic number, because the mean of its divisors is an integer number (40942456).

Almost surely, 2^81884911 is an apocalyptic number.

81884911 is a deficient number, since it is larger than the sum of its proper divisors (1).

81884911 is an equidigital number, since it uses as much as digits as its factorization.

81884911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 40.

The square root of 81884911 is about 9049.0281798655. The cubic root of 81884911 is about 434.2448005549.

The spelling of 81884911 in words is "eighty-one million, eight hundred eighty-four thousand, nine hundred eleven".