85171647 has 8 divisors (see below), whose sum is σ = 123886080. Its totient is φ = 51619160.

The previous prime is 85171643. The next prime is 85171657. The reversal of 85171647 is 74617158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85171647 - 2² = 85171643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85171643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1290447 + ... + 1290512.

It is an arithmetic number, because the mean of its divisors is an integer number (15485760).

Almost surely, 2^85171647 is an apocalyptic number.

85171647 is a deficient number, since it is larger than the sum of its proper divisors (38714433).

85171647 is a wasteful number, since it uses less digits than its factorization.

85171647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580973.

The product of its digits is 47040, while the sum is 39.

The square root of 85171647 is about 9228.8486280792. The cubic root of 85171647 is about 439.9787300324.

The spelling of 85171647 in words is "eighty-five million, one hundred seventy-one thousand, six hundred forty-seven".