216115 has 4 divisors (see below), whose sum is σ = 259344. Its totient is φ = 172888.

The previous prime is 216113. The next prime is 216119. The reversal of 216115 is 511612.

It is a happy number.

216115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216115 - 2¹ = 216113 is a prime.

It is a Duffinian number.

216115 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (216113) 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, 21607 + ... + 21616.

It is an arithmetic number, because the mean of its divisors is an integer number (64836).

2²¹⁶¹¹⁵ is an apocalyptic number.

216115 is a deficient number, since it is larger than the sum of its proper divisors (43229).

216115 is an equidigital number, since it uses as much as digits as its factorization.

216115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43228.

The product of its digits is 60, while the sum is 16.

The square root of 216115 is about 464.8817053832. The cubic root of 216115 is about 60.0106462590.

Adding to 216115 its reverse (511612), we get a palindrome (727727).

The spelling of 216115 in words is "two hundred sixteen thousand, one hundred fifteen".