172243211 has 8 divisors (see below), whose sum is σ = 197029344. Its totient is φ = 147502080.

The previous prime is 172243187. The next prime is 172243219. The reversal of 172243211 is 112342271.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172243211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172243219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2600 + ... + 18741.

It is an arithmetic number, because the mean of its divisors is an integer number (24628668).

Almost surely, 2^172243211 is an apocalyptic number.

172243211 is a deficient number, since it is larger than the sum of its proper divisors (24786133).

172243211 is a wasteful number, since it uses less digits than its factorization.

172243211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22501.

The product of its digits is 672, while the sum is 23.

The square root of 172243211 is about 13124.1461055567. The cubic root of 172243211 is about 556.3917789337.

Adding to 172243211 its reverse (112342271), we get a palindrome (284585482).

The spelling of 172243211 in words is "one hundred seventy-two million, two hundred forty-three thousand, two hundred eleven".