216869243 has 2 divisors, whose sum is σ = 216869244. Its totient is φ = 216869242.

The previous prime is 216869239. The next prime is 216869251. The reversal of 216869243 is 342968612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216869243 - 2² = 216869239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216869243.

It is not a weakly prime, because it can be changed into another prime (216869293) 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, 108434621 + 108434622.

It is an arithmetic number, because the mean of its divisors is an integer number (108434622).

Almost surely, 2^216869243 is an apocalyptic number.

216869243 is a deficient number, since it is larger than the sum of its proper divisors (1).

216869243 is an equidigital number, since it uses as much as digits as its factorization.

216869243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 216869243 is about 14726.4810121088. The cubic root of 216869243 is about 600.8037773853.

The spelling of 216869243 in words is "two hundred sixteen million, eight hundred sixty-nine thousand, two hundred forty-three".