216336161 has 2 divisors, whose sum is σ = 216336162. Its totient is φ = 216336160.

The previous prime is 216336149. The next prime is 216336163. The reversal of 216336161 is 161633612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212255761 + 4080400 = 14569^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 216336161 - 2¹⁴ = 216319777 is a prime.

It is a Sophie Germain prime.

Together with 216336163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (216336163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108168080 + 108168081.

It is an arithmetic number, because the mean of its divisors is an integer number (108168081).

Almost surely, 2^216336161 is an apocalyptic number.

It is an amenable number.

216336161 is a deficient number, since it is larger than the sum of its proper divisors (1).

216336161 is an equidigital number, since it uses as much as digits as its factorization.

216336161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 216336161 is about 14708.3704399910. The cubic root of 216336161 is about 600.3110988531.

Adding to 216336161 its reverse (161633612), we get a palindrome (377969773).

The spelling of 216336161 in words is "two hundred sixteen million, three hundred thirty-six thousand, one hundred sixty-one".