172573221 has 8 divisors (see below), whose sum is σ = 230217120. Its totient is φ = 114989072.

The previous prime is 172573211. The next prime is 172573231. The reversal of 172573221 is 122375271.

It is an interprime number because it is at equal distance from previous prime (172573211) and next prime (172573231).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172573221 - 2⁵ = 172573189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172573201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7695 + ... + 20108.

It is an arithmetic number, because the mean of its divisors is an integer number (28777140).

Almost surely, 2^172573221 is an apocalyptic number.

It is an amenable number.

172573221 is a deficient number, since it is larger than the sum of its proper divisors (57643899).

172573221 is a wasteful number, since it uses less digits than its factorization.

172573221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29875.

The product of its digits is 5880, while the sum is 30.

The square root of 172573221 is about 13136.7127166578. The cubic root of 172573221 is about 556.7468925135.

The spelling of 172573221 in words is "one hundred seventy-two million, five hundred seventy-three thousand, two hundred twenty-one".