85171147 has 2 divisors, whose sum is σ = 85171148. Its totient is φ = 85171146.

The previous prime is 85171127. The next prime is 85171181. The reversal of 85171147 is 74117158.

It is an a-pointer prime, because the next prime (85171181) can be obtained adding 85171147 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85171147 - 2⁷ = 85171019 is a prime.

It is not a weakly prime, because it can be changed into another prime (85171127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42585573 + 42585574.

It is an arithmetic number, because the mean of its divisors is an integer number (42585574).

Almost surely, 2^85171147 is an apocalyptic number.

85171147 is a deficient number, since it is larger than the sum of its proper divisors (1).

85171147 is an equidigital number, since it uses as much as digits as its factorization.

85171147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7840, while the sum is 34.

The square root of 85171147 is about 9228.8215390699. The cubic root of 85171147 is about 439.9778690659.

The spelling of 85171147 in words is "eighty-five million, one hundred seventy-one thousand, one hundred forty-seven".