172171228 has 6 divisors (see below), whose sum is σ = 301299656. Its totient is φ = 86085612.

The previous prime is 172171213. The next prime is 172171253. The reversal of 172171228 is 822171271.

It is a self number, because there is not a number n which added to its sum of digits gives 172171228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21521400 + ... + 21521407.

Almost surely, 2^172171228 is an apocalyptic number.

It is an amenable number.

172171228 is a deficient number, since it is larger than the sum of its proper divisors (129128428).

172171228 is a wasteful number, since it uses less digits than its factorization.

172171228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43042811 (or 43042809 counting only the distinct ones).

The product of its digits is 3136, while the sum is 31.

The square root of 172171228 is about 13121.4034310359. The cubic root of 172171228 is about 556.3142600003.

The spelling of 172171228 in words is "one hundred seventy-two million, one hundred seventy-one thousand, two hundred twenty-eight".