217368233 has 2 divisors, whose sum is σ = 217368234. Its totient is φ = 217368232.

The previous prime is 217368209. The next prime is 217368241. The reversal of 217368233 is 332863712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180983209 + 36385024 = 13453^2 + 6032^2 .

It is a cyclic number.

It is not a de Polignac number, because 217368233 - 2¹² = 217364137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 217368193 and 217368202.

It is not a weakly prime, because it can be changed into another prime (217368293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108684116 + 108684117.

It is an arithmetic number, because the mean of its divisors is an integer number (108684117).

Almost surely, 2^217368233 is an apocalyptic number.

It is an amenable number.

217368233 is a deficient number, since it is larger than the sum of its proper divisors (1).

217368233 is an equidigital number, since it uses as much as digits as its factorization.

217368233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 35.

The square root of 217368233 is about 14743.4132072597. The cubic root of 217368233 is about 601.2642167964.

The spelling of 217368233 in words is "two hundred seventeen million, three hundred sixty-eight thousand, two hundred thirty-three".