171215871 has 8 divisors (see below), whose sum is σ = 228386304. Its totient is φ = 114094680.

The previous prime is 171215867. The next prime is 171215873. The reversal of 171215871 is 178512171.

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

It is not a de Polignac number, because 171215871 - 2² = 171215867 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171215873) 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, 3241 + ... + 18786.

It is an arithmetic number, because the mean of its divisors is an integer number (28548288).

Almost surely, 2^171215871 is an apocalyptic number.

171215871 is a deficient number, since it is larger than the sum of its proper divisors (57170433).

171215871 is a wasteful number, since it uses less digits than its factorization.

171215871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24621.

The product of its digits is 3920, while the sum is 33.

The square root of 171215871 is about 13084.9482612657. The cubic root of 171215871 is about 555.2833777268.

The spelling of 171215871 in words is "one hundred seventy-one million, two hundred fifteen thousand, eight hundred seventy-one".