172001871 has 12 divisors (see below), whose sum is σ = 257014680. Its totient is φ = 110713680.

The previous prime is 172001867. The next prime is 172001887. The reversal of 172001871 is 178100271.

It is not a de Polignac number, because 172001871 - 2² = 172001867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172001861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329245 + ... + 329766.

It is an arithmetic number, because the mean of its divisors is an integer number (21417890).

Almost surely, 2^172001871 is an apocalyptic number.

172001871 is a deficient number, since it is larger than the sum of its proper divisors (85012809).

172001871 is a wasteful number, since it uses less digits than its factorization.

172001871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659046 (or 659043 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 172001871 is about 13114.9483796163. The cubic root of 172001871 is about 556.1317931541.

The spelling of 172001871 in words is "one hundred seventy-two million, one thousand, eight hundred seventy-one".