818656243 has 2 divisors, whose sum is σ = 818656244. Its totient is φ = 818656242.

The previous prime is 818656229. The next prime is 818656291. The reversal of 818656243 is 342656818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 818656243 - 2¹⁷ = 818525171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 818656243.

It is not a weakly prime, because it can be changed into another prime (818656343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409328121 + 409328122.

It is an arithmetic number, because the mean of its divisors is an integer number (409328122).

Almost surely, 2^818656243 is an apocalyptic number.

818656243 is a deficient number, since it is larger than the sum of its proper divisors (1).

818656243 is an equidigital number, since it uses as much as digits as its factorization.

818656243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 43.

The square root of 818656243 is about 28612.1694913196. The cubic root of 818656243 is about 935.4786050004.

The spelling of 818656243 in words is "eight hundred eighteen million, six hundred fifty-six thousand, two hundred forty-three".