81814867 has 2 divisors, whose sum is σ = 81814868. Its totient is φ = 81814866.

The previous prime is 81814801. The next prime is 81814877. The reversal of 81814867 is 76841818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81814867 - 2⁷ = 81814739 is a prime.

It is not a weakly prime, because it can be changed into another prime (81814877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40907433 + 40907434.

It is an arithmetic number, because the mean of its divisors is an integer number (40907434).

Almost surely, 2^81814867 is an apocalyptic number.

81814867 is a deficient number, since it is larger than the sum of its proper divisors (1).

81814867 is an equidigital number, since it uses as much as digits as its factorization.

81814867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 43.

The square root of 81814867 is about 9045.1571020077. The cubic root of 81814867 is about 434.1209481903.

The spelling of 81814867 in words is "eighty-one million, eight hundred fourteen thousand, eight hundred sixty-seven".