216031243 has 2 divisors, whose sum is σ = 216031244. Its totient is φ = 216031242.

The previous prime is 216031241. The next prime is 216031259. The reversal of 216031243 is 342130612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216031243 - 2¹ = 216031241 is a prime.

Together with 216031241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (216031241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108015621 + 108015622.

It is an arithmetic number, because the mean of its divisors is an integer number (108015622).

Almost surely, 2^216031243 is an apocalyptic number.

216031243 is a deficient number, since it is larger than the sum of its proper divisors (1).

216031243 is an equidigital number, since it uses as much as digits as its factorization.

216031243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 216031243 is about 14698.0013267111. The cubic root of 216031243 is about 600.0289273090.

Adding to 216031243 its reverse (342130612), we get a palindrome (558161855).

The spelling of 216031243 in words is "two hundred sixteen million, thirty-one thousand, two hundred forty-three".