216344161 has 8 divisors (see below), whose sum is σ = 236849184. Its totient is φ = 195978720.

The previous prime is 216344153. The next prime is 216344189. The reversal of 216344161 is 161443612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216344161 - 2³ = 216344153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216344101) 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 in 7 ways as a sum of consecutive naturals, for example, 31636 + ... + 37861.

It is an arithmetic number, because the mean of its divisors is an integer number (29606148).

Almost surely, 2^216344161 is an apocalyptic number.

It is an amenable number.

216344161 is a deficient number, since it is larger than the sum of its proper divisors (20505023).

216344161 is a wasteful number, since it uses less digits than its factorization.

216344161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69791.

The product of its digits is 3456, while the sum is 28.

The square root of 216344161 is about 14708.6423914650. The cubic root of 216344161 is about 600.3184984939.

Adding to 216344161 its reverse (161443612), we get a palindrome (377787773).

The spelling of 216344161 in words is "two hundred sixteen million, three hundred forty-four thousand, one hundred sixty-one".