172212443 has 4 divisors (see below), whose sum is σ = 185459568. Its totient is φ = 158965320.

The previous prime is 172212421. The next prime is 172212449. The reversal of 172212443 is 344212271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172212443 - 2⁶ = 172212379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172212449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6623543 + ... + 6623568.

It is an arithmetic number, because the mean of its divisors is an integer number (46364892).

Almost surely, 2^172212443 is an apocalyptic number.

172212443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

172212443 is a deficient number, since it is larger than the sum of its proper divisors (13247125).

172212443 is a wasteful number, since it uses less digits than its factorization.

172212443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13247124.

The product of its digits is 2688, while the sum is 26.

The square root of 172212443 is about 13122.9738626578. The cubic root of 172212443 is about 556.3586473295.

The spelling of 172212443 in words is "one hundred seventy-two million, two hundred twelve thousand, four hundred forty-three".