216311117 has 4 divisors (see below), whose sum is σ = 235975776. Its totient is φ = 196646460.

The previous prime is 216311107. The next prime is 216311153. The reversal of 216311117 is 711113612.

It is a happy number.

216311117 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, 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 216311117 - 2⁴ = 216311101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216311092 and 216311101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216311107) 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, 9832313 + ... + 9832334.

It is an arithmetic number, because the mean of its divisors is an integer number (58993944).

Almost surely, 2^216311117 is an apocalyptic number.

It is an amenable number.

216311117 is a deficient number, since it is larger than the sum of its proper divisors (19664659).

216311117 is a wasteful number, since it uses less digits than its factorization.

216311117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19664658.

The product of its digits is 252, while the sum is 23.

The square root of 216311117 is about 14707.5190633907. The cubic root of 216311117 is about 600.2879330984.

Adding to 216311117 its reverse (711113612), we get a palindrome (927424729).

The spelling of 216311117 in words is "two hundred sixteen million, three hundred eleven thousand, one hundred seventeen".