172330211 has 2 divisors, whose sum is σ = 172330212. Its totient is φ = 172330210.

The previous prime is 172330141. The next prime is 172330217. The reversal of 172330211 is 112033271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172330211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (172330217) 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, 86165105 + 86165106.

It is an arithmetic number, because the mean of its divisors is an integer number (86165106).

Almost surely, 2^172330211 is an apocalyptic number.

172330211 is a deficient number, since it is larger than the sum of its proper divisors (1).

172330211 is an equidigital number, since it uses as much as digits as its factorization.

172330211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 172330211 is about 13127.4601884751. The cubic root of 172330211 is about 556.4854409457.

Adding to 172330211 its reverse (112033271), we get a palindrome (284363482).

The spelling of 172330211 in words is "one hundred seventy-two million, three hundred thirty thousand, two hundred eleven".