81096971 has 2 divisors, whose sum is σ = 81096972. Its totient is φ = 81096970.

The previous prime is 81096923. The next prime is 81096979. The reversal of 81096971 is 17969018.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81096971 - 2⁶ = 81096907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81096979) 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, 40548485 + 40548486.

It is an arithmetic number, because the mean of its divisors is an integer number (40548486).

Almost surely, 2^81096971 is an apocalyptic number.

81096971 is a deficient number, since it is larger than the sum of its proper divisors (1).

81096971 is an equidigital number, since it uses as much as digits as its factorization.

81096971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 81096971 is about 9005.3856663665. The cubic root of 81096971 is about 432.8474644372.

The spelling of 81096971 in words is "eighty-one million, ninety-six thousand, nine hundred seventy-one".