81816883 has 2 divisors, whose sum is σ = 81816884. Its totient is φ = 81816882.

The previous prime is 81816871. The next prime is 81816901. The reversal of 81816883 is 38861818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81816883 - 2⁵ = 81816851 is a prime.

It is not a weakly prime, because it can be changed into another prime (81816863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40908441 + 40908442.

It is an arithmetic number, because the mean of its divisors is an integer number (40908442).

Almost surely, 2^81816883 is an apocalyptic number.

81816883 is a deficient number, since it is larger than the sum of its proper divisors (1).

81816883 is an equidigital number, since it uses as much as digits as its factorization.

81816883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 43.

The square root of 81816883 is about 9045.2685421716. The cubic root of 81816883 is about 434.1245138855.

The spelling of 81816883 in words is "eighty-one million, eight hundred sixteen thousand, eight hundred eighty-three".