216983911 has 4 divisors (see below), whose sum is σ = 223983424. Its totient is φ = 209984400.

The previous prime is 216983867. The next prime is 216983929. The reversal of 216983911 is 119389612.

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 216983911 - 2⁹ = 216983399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216983951) 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, 3499710 + ... + 3499771.

It is an arithmetic number, because the mean of its divisors is an integer number (55995856).

Almost surely, 2^216983911 is an apocalyptic number.

216983911 is a deficient number, since it is larger than the sum of its proper divisors (6999513).

216983911 is an equidigital number, since it uses as much as digits as its factorization.

216983911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6999512.

The product of its digits is 23328, while the sum is 40.

The square root of 216983911 is about 14730.3737562901. The cubic root of 216983911 is about 600.9096489049.

The spelling of 216983911 in words is "two hundred sixteen million, nine hundred eighty-three thousand, nine hundred eleven".