172171215 has 24 divisors (see below), whose sum is σ = 311407200. Its totient is φ = 87831744.

The previous prime is 172171213. The next prime is 172171253. The reversal of 172171215 is 512171271.

It is not a de Polignac number, because 172171215 - 2¹ = 172171213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172171211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82140 + ... + 84209.

It is an arithmetic number, because the mean of its divisors is an integer number (12975300).

Almost surely, 2^172171215 is an apocalyptic number.

172171215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172171215 is a deficient number, since it is larger than the sum of its proper divisors (139235985).

172171215 is a wasteful number, since it uses less digits than its factorization.

172171215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166383 (or 166380 counting only the distinct ones).

The product of its digits is 980, while the sum is 27.

The square root of 172171215 is about 13121.4029356620. The cubic root of 172171215 is about 556.3142459986.

The spelling of 172171215 in words is "one hundred seventy-two million, one hundred seventy-one thousand, two hundred fifteen".