216565229 has 2 divisors, whose sum is σ = 216565230. Its totient is φ = 216565228.

The previous prime is 216565201. The next prime is 216565241. The reversal of 216565229 is 922565612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215796100 + 769129 = 14690^2 + 877^2 .

It is a cyclic number.

It is not a de Polignac number, because 216565229 - 2⁸ = 216564973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216565192 and 216565201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216565259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108282614 + 108282615.

It is an arithmetic number, because the mean of its divisors is an integer number (108282615).

Almost surely, 2^216565229 is an apocalyptic number.

It is an amenable number.

216565229 is a deficient number, since it is larger than the sum of its proper divisors (1).

216565229 is an equidigital number, since it uses as much as digits as its factorization.

216565229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 38.

The square root of 216565229 is about 14716.1553742817. The cubic root of 216565229 is about 600.5229043379.

The spelling of 216565229 in words is "two hundred sixteen million, five hundred sixty-five thousand, two hundred twenty-nine".