171225820 has 24 divisors (see below), whose sum is σ = 359830800. Its totient is φ = 68441472.

The previous prime is 171225809. The next prime is 171225833. The reversal of 171225820 is 28522171.

171225820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41616 + ... + 45544.

It is an arithmetic number, because the mean of its divisors is an integer number (14992950).

Almost surely, 2^171225820 is an apocalyptic number.

171225820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171225820 is an abundant number, since it is smaller than the sum of its proper divisors (188604980).

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

171225820 is a wasteful number, since it uses less digits than its factorization.

171225820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6117 (or 6115 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 171225820 is about 13085.3284253778. The cubic root of 171225820 is about 555.2941329745.

Adding to 171225820 its reverse (28522171), we get a palindrome (199747991).

The spelling of 171225820 in words is "one hundred seventy-one million, two hundred twenty-five thousand, eight hundred twenty".