216430171 has 2 divisors, whose sum is σ = 216430172. Its totient is φ = 216430170.

The previous prime is 216430169. The next prime is 216430241. The reversal of 216430171 is 171034612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216430171 - 2¹ = 216430169 is a prime.

Together with 216430169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (216430141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108215085 + 108215086.

It is an arithmetic number, because the mean of its divisors is an integer number (108215086).

Almost surely, 2^216430171 is an apocalyptic number.

216430171 is a deficient number, since it is larger than the sum of its proper divisors (1).

216430171 is an equidigital number, since it uses as much as digits as its factorization.

216430171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 216430171 is about 14711.5658921816. The cubic root of 216430171 is about 600.3980423602.

Adding to 216430171 its reverse (171034612), we get a palindrome (387464783).

The spelling of 216430171 in words is "two hundred sixteen million, four hundred thirty thousand, one hundred seventy-one".