818889223 has 2 divisors, whose sum is σ = 818889224. Its totient is φ = 818889222.

The previous prime is 818889173. The next prime is 818889233. The reversal of 818889223 is 322988818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 818889223 - 2²⁵ = 785334791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818889233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409444611 + 409444612.

It is an arithmetic number, because the mean of its divisors is an integer number (409444612).

Almost surely, 2^818889223 is an apocalyptic number.

818889223 is a deficient number, since it is larger than the sum of its proper divisors (1).

818889223 is an equidigital number, since it uses as much as digits as its factorization.

818889223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 442368, while the sum is 49.

The square root of 818889223 is about 28616.2405462353. The cubic root of 818889223 is about 935.5673386764.

The spelling of 818889223 in words is "eight hundred eighteen million, eight hundred eighty-nine thousand, two hundred twenty-three".