201111217 has 2 divisors, whose sum is σ = 201111218. Its totient is φ = 201111216.

The previous prime is 201111161. The next prime is 201111221. The reversal of 201111217 is 712111102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137733696 + 63377521 = 11736^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 201111217 - 2⁷ = 201111089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201111217.

It is not a weakly prime, because it can be changed into another prime (201111227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555608 + 100555609.

It is an arithmetic number, because the mean of its divisors is an integer number (100555609).

Almost surely, 2^201111217 is an apocalyptic number.

It is an amenable number.

201111217 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111217 is an equidigital number, since it uses as much as digits as its factorization.

201111217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 201111217 is about 14181.3686575027. The cubic root of 201111217 is about 585.8846206696.

Adding to 201111217 its reverse (712111102), we get a palindrome (913222319).

The spelling of 201111217 in words is "two hundred one million, one hundred eleven thousand, two hundred seventeen".