171225222 has 64 divisors (see below), whose sum is σ = 407185920. Its totient is φ = 46964736.

The previous prime is 171225211. The next prime is 171225227. The reversal of 171225222 is 222522171.

It is a junction number, because it is equal to n+sod(n) for n = 171225192 and 171225201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171225227) 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 31 ways as a sum of consecutive naturals, for example, 312753 + ... + 313299.

It is an arithmetic number, because the mean of its divisors is an integer number (6362280).

Almost surely, 2^171225222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171225222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203592960).

171225222 is an abundant number, since it is smaller than the sum of its proper divisors (235960698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171225222 is a wasteful number, since it uses less digits than its factorization.

171225222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

The product of its digits is 1120, while the sum is 24.

The square root of 171225222 is about 13085.3055753391. The cubic root of 171225222 is about 555.2934865255.

Adding to 171225222 its reverse (222522171), we get a palindrome (393747393).

The spelling of 171225222 in words is "one hundred seventy-one million, two hundred twenty-five thousand, two hundred twenty-two".