216710231 has 2 divisors, whose sum is σ = 216710232. Its totient is φ = 216710230.

The previous prime is 216710213. The next prime is 216710233. The reversal of 216710231 is 132017612.

Together with previous prime (216710213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216710231 - 2⁶ = 216710167 is a prime.

It is a super-2 number, since 2×216710231² = 93926648440146722, which contains 22 as substring.

Together with 216710233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216710197 and 216710206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216710233) 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, 108355115 + 108355116.

It is an arithmetic number, because the mean of its divisors is an integer number (108355116).

Almost surely, 2^216710231 is an apocalyptic number.

216710231 is a deficient number, since it is larger than the sum of its proper divisors (1).

216710231 is an equidigital number, since it uses as much as digits as its factorization.

216710231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 216710231 is about 14721.0811763267. The cubic root of 216710231 is about 600.6569018338.

Adding to 216710231 its reverse (132017612), we get a palindrome (348727843).

The spelling of 216710231 in words is "two hundred sixteen million, seven hundred ten thousand, two hundred thirty-one".