216511411 has 2 divisors, whose sum is σ = 216511412. Its totient is φ = 216511410.

The previous prime is 216511391. The next prime is 216511417. The reversal of 216511411 is 114115612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216511411 - 2²⁵ = 182956979 is a prime.

It is not a weakly prime, because it can be changed into another prime (216511417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108255705 + 108255706.

It is an arithmetic number, because the mean of its divisors is an integer number (108255706).

Almost surely, 2^216511411 is an apocalyptic number.

216511411 is a deficient number, since it is larger than the sum of its proper divisors (1).

216511411 is an equidigital number, since it uses as much as digits as its factorization.

216511411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 22.

The square root of 216511411 is about 14714.3267260177. The cubic root of 216511411 is about 600.4731554788.

The spelling of 216511411 in words is "two hundred sixteen million, five hundred eleven thousand, four hundred eleven".