81400850171 has 2 divisors, whose sum is σ = 81400850172. Its totient is φ = 81400850170.

The previous prime is 81400850129. The next prime is 81400850173. The reversal of 81400850171 is 17105800418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81400850171 - 2¹⁰ = 81400849147 is a prime.

Together with 81400850173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81400850173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40700425085 + 40700425086.

It is an arithmetic number, because the mean of its divisors is an integer number (40700425086).

Almost surely, 2^81400850171 is an apocalyptic number.

81400850171 is a deficient number, since it is larger than the sum of its proper divisors (1).

81400850171 is an equidigital number, since it uses as much as digits as its factorization.

81400850171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 35.

The spelling of 81400850171 in words is "eighty-one billion, four hundred million, eight hundred fifty thousand, one hundred seventy-one".