216188171 has 2 divisors, whose sum is σ = 216188172. Its totient is φ = 216188170.

The previous prime is 216188149. The next prime is 216188173. The reversal of 216188171 is 171881612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216188171 - 2⁶ = 216188107 is a prime.

Together with 216188173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216188173) 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, 108094085 + 108094086.

It is an arithmetic number, because the mean of its divisors is an integer number (108094086).

Almost surely, 2^216188171 is an apocalyptic number.

216188171 is a deficient number, since it is larger than the sum of its proper divisors (1).

216188171 is an equidigital number, since it uses as much as digits as its factorization.

216188171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 35.

The square root of 216188171 is about 14703.3387704970. The cubic root of 216188171 is about 600.1741818370.

The spelling of 216188171 in words is "two hundred sixteen million, one hundred eighty-eight thousand, one hundred seventy-one".