172217233 has 2 divisors, whose sum is σ = 172217234. Its totient is φ = 172217232.

The previous prime is 172217231. The next prime is 172217237. The reversal of 172217233 is 332712271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155176849 + 17040384 = 12457^2 + 4128^2 .

It is an emirp because it is prime and its reverse (332712271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172217233 - 2¹ = 172217231 is a prime.

Together with 172217231, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (172217231) 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 as a sum of consecutive naturals, namely, 86108616 + 86108617.

It is an arithmetic number, because the mean of its divisors is an integer number (86108617).

Almost surely, 2^172217233 is an apocalyptic number.

It is an amenable number.

172217233 is a deficient number, since it is larger than the sum of its proper divisors (1).

172217233 is an equidigital number, since it uses as much as digits as its factorization.

172217233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 172217233 is about 13123.1563657529. The cubic root of 172217233 is about 556.3638055576.

The spelling of 172217233 in words is "one hundred seventy-two million, two hundred seventeen thousand, two hundred thirty-three".