172221239 has 8 divisors (see below), whose sum is σ = 175412880. Its totient is φ = 169041600.

The previous prime is 172221233. The next prime is 172221241. The reversal of 172221239 is 932122271.

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 172221239 - 2⁴ = 172221223 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 (172221233) 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, 29072 + ... + 34490.

It is an arithmetic number, because the mean of its divisors is an integer number (21926610).

Almost surely, 2^172221239 is an apocalyptic number.

172221239 is a deficient number, since it is larger than the sum of its proper divisors (3191641).

172221239 is an equidigital number, since it uses as much as digits as its factorization.

172221239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6001.

The product of its digits is 3024, while the sum is 29.

The square root of 172221239 is about 13123.3089958288. The cubic root of 172221239 is about 556.3681194428.

The spelling of 172221239 in words is "one hundred seventy-two million, two hundred twenty-one thousand, two hundred thirty-nine".