216222689 has 2 divisors, whose sum is σ = 216222690. Its totient is φ = 216222688.

The previous prime is 216222683. The next prime is 216222697. The reversal of 216222689 is 986222612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203205025 + 13017664 = 14255^2 + 3608^2 .

It is a cyclic number.

It is not a de Polignac number, because 216222689 - 2⁴ = 216222673 is a prime.

It is not a weakly prime, because it can be changed into another prime (216222683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108111344 + 108111345.

It is an arithmetic number, because the mean of its divisors is an integer number (108111345).

Almost surely, 2^216222689 is an apocalyptic number.

It is an amenable number.

216222689 is a deficient number, since it is larger than the sum of its proper divisors (1).

216222689 is an equidigital number, since it uses as much as digits as its factorization.

216222689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 216222689 is about 14704.5125386733. The cubic root of 216222689 is about 600.2061226995.

The spelling of 216222689 in words is "two hundred sixteen million, two hundred twenty-two thousand, six hundred eighty-nine".