216943589 has 2 divisors, whose sum is σ = 216943590. Its totient is φ = 216943588.

The previous prime is 216943541. The next prime is 216943603. The reversal of 216943589 is 985349612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203290564 + 13653025 = 14258^2 + 3695^2 .

It is a cyclic number.

It is not a de Polignac number, because 216943589 - 2⁸ = 216943333 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216943289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108471794 + 108471795.

It is an arithmetic number, because the mean of its divisors is an integer number (108471795).

Almost surely, 2^216943589 is an apocalyptic number.

It is an amenable number.

216943589 is a deficient number, since it is larger than the sum of its proper divisors (1).

216943589 is an equidigital number, since it uses as much as digits as its factorization.

216943589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 47.

The square root of 216943589 is about 14729.0050241013. The cubic root of 216943589 is about 600.8724243632.

The spelling of 216943589 in words is "two hundred sixteen million, nine hundred forty-three thousand, five hundred eighty-nine".