216115161 has 4 divisors (see below), whose sum is σ = 288153552. Its totient is φ = 144076772.

The previous prime is 216115147. The next prime is 216115181. The reversal of 216115161 is 161511612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216115161 - 2⁵ = 216115129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216115181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36019191 + ... + 36019196.

It is an arithmetic number, because the mean of its divisors is an integer number (72038388).

Almost surely, 2^216115161 is an apocalyptic number.

It is an amenable number.

216115161 is a deficient number, since it is larger than the sum of its proper divisors (72038391).

216115161 is an equidigital number, since it uses as much as digits as its factorization.

216115161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72038390.

The product of its digits is 360, while the sum is 24.

The square root of 216115161 is about 14700.8557914157. The cubic root of 216115161 is about 600.1066116110.

Adding to 216115161 its reverse (161511612), we get a palindrome (377626773).

The spelling of 216115161 in words is "two hundred sixteen million, one hundred fifteen thousand, one hundred sixty-one".