171164221 has 4 divisors (see below), whose sum is σ = 171261792. Its totient is φ = 171066652.

The previous prime is 171164219. The next prime is 171164233. The reversal of 171164221 is 122461171.

171164221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 171164221 - 2¹ = 171164219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171164261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46105 + ... + 49678.

It is an arithmetic number, because the mean of its divisors is an integer number (42815448).

Almost surely, 2^171164221 is an apocalyptic number.

It is an amenable number.

171164221 is a deficient number, since it is larger than the sum of its proper divisors (97571).

171164221 is an equidigital number, since it uses as much as digits as its factorization.

171164221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97570.

The product of its digits is 672, while the sum is 25.

The square root of 171164221 is about 13082.9744706622. The cubic root of 171164221 is about 555.2275354135.

The spelling of 171164221 in words is "one hundred seventy-one million, one hundred sixty-four thousand, two hundred twenty-one".