172925221 has 8 divisors (see below), whose sum is σ = 198633600. Its totient is φ = 147468048.

The previous prime is 172925219. The next prime is 172925237. The reversal of 172925221 is 122529271.

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

It is not a de Polignac number, because 172925221 - 2¹ = 172925219 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 (172925281) 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, 61321 + ... + 64078.

It is an arithmetic number, because the mean of its divisors is an integer number (24829200).

Almost surely, 2^172925221 is an apocalyptic number.

It is an amenable number.

172925221 is a deficient number, since it is larger than the sum of its proper divisors (25708379).

172925221 is a wasteful number, since it uses less digits than its factorization.

172925221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125603.

The product of its digits is 5040, while the sum is 31.

The square root of 172925221 is about 13150.1034596691. The cubic root of 172925221 is about 557.1251702315.

The spelling of 172925221 in words is "one hundred seventy-two million, nine hundred twenty-five thousand, two hundred twenty-one".