171215228 has 24 divisors (see below), whose sum is σ = 323244432. Its totient is φ = 79049984.

The previous prime is 171215203. The next prime is 171215249. The reversal of 171215228 is 822512171.

It is a self number, because there is not a number n which added to its sum of digits gives 171215228.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20150 + ... + 27357.

It is an arithmetic number, because the mean of its divisors is an integer number (13468518).

Almost surely, 2^171215228 is an apocalyptic number.

It is an amenable number.

171215228 is a deficient number, since it is larger than the sum of its proper divisors (152029204).

171215228 is a wasteful number, since it uses less digits than its factorization.

171215228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47581 (or 47579 counting only the distinct ones).

The product of its digits is 2240, while the sum is 29.

The square root of 171215228 is about 13084.9236910270. The cubic root of 171215228 is about 555.2826826049.

Adding to 171215228 its reverse (822512171), we get a palindrome (993727399).

The spelling of 171215228 in words is "one hundred seventy-one million, two hundred fifteen thousand, two hundred twenty-eight".