85171871 has 2 divisors, whose sum is σ = 85171872. Its totient is φ = 85171870.

The previous prime is 85171847. The next prime is 85171897. The reversal of 85171871 is 17817158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85171871 - 2¹⁰ = 85170847 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85171841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42585935 + 42585936.

It is an arithmetic number, because the mean of its divisors is an integer number (42585936).

Almost surely, 2^85171871 is an apocalyptic number.

85171871 is a deficient number, since it is larger than the sum of its proper divisors (1).

85171871 is an equidigital number, since it uses as much as digits as its factorization.

85171871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 38.

The square root of 85171871 is about 9228.8607639296. The cubic root of 85171871 is about 439.9791157443.

The spelling of 85171871 in words is "eighty-five million, one hundred seventy-one thousand, eight hundred seventy-one".