81080171 has 2 divisors, whose sum is σ = 81080172. Its totient is φ = 81080170.

The previous prime is 81080141. The next prime is 81080173. The reversal of 81080171 is 17108018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81080171 - 2⁶ = 81080107 is a prime.

It is a Sophie Germain prime.

Together with 81080173, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81080171.

It is not a weakly prime, because it can be changed into another prime (81080173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40540085 + 40540086.

It is an arithmetic number, because the mean of its divisors is an integer number (40540086).

Almost surely, 2^81080171 is an apocalyptic number.

81080171 is a deficient number, since it is larger than the sum of its proper divisors (1).

81080171 is an equidigital number, since it uses as much as digits as its factorization.

81080171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 81080171 is about 9004.4528428995. The cubic root of 81080171 is about 432.8175728990.

Adding to 81080171 its reverse (17108018), we get a palindrome (98188189).

It can be divided in two parts, 8108017 and 1, that added together give a palindrome (8108018).

The spelling of 81080171 in words is "eighty-one million, eighty thousand, one hundred seventy-one".