216112161 has 8 divisors (see below), whose sum is σ = 290700000. Its totient is φ = 142799552.

The previous prime is 216112151. The next prime is 216112181. The reversal of 216112161 is 161211612.

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 216112161 - 2⁷ = 216112033 is a prime.

It is a super-2 number, since 2×216112161² = 93408932264179842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216112121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318411 + ... + 319088.

It is an arithmetic number, because the mean of its divisors is an integer number (36337500).

Almost surely, 2^216112161 is an apocalyptic number.

It is an amenable number.

216112161 is a deficient number, since it is larger than the sum of its proper divisors (74587839).

216112161 is a wasteful number, since it uses less digits than its factorization.

216112161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637615.

The product of its digits is 144, while the sum is 21.

The square root of 216112161 is about 14700.7537561854. The cubic root of 216112161 is about 600.1038348073.

Adding to 216112161 its reverse (161211612), we get a palindrome (377323773).

The spelling of 216112161 in words is "two hundred sixteen million, one hundred twelve thousand, one hundred sixty-one".