2211689 has 2 divisors, whose sum is σ = 2211690. Its totient is φ = 2211688.

The previous prime is 2211667. The next prime is 2211707. The reversal of 2211689 is 9861122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2131600 + 80089 = 1460^2 + 283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211689 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2211889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105844 + 1105845.

It is an arithmetic number, because the mean of its divisors is an integer number (1105845).

2^2211689 is an apocalyptic number.

It is an amenable number.

2211689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211689 is an equidigital number, since it uses as much as digits as its factorization.

2211689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 2211689 is about 1487.1748384101. The cubic root of 2211689 is about 130.2890805619.

It can be divided in two parts, 22 and 11689, that added together give a palindrome (11711).

The spelling of 2211689 in words is "two million, two hundred eleven thousand, six hundred eighty-nine".