818919923 has 2 divisors, whose sum is σ = 818919924. Its totient is φ = 818919922.

The previous prime is 818919917. The next prime is 818919929. The reversal of 818919923 is 329919818.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (818919917) and next prime (818919929).

It is a cyclic number.

It is not a de Polignac number, because 818919923 - 2²⁶ = 751811059 is a prime.

It is not a weakly prime, because it can be changed into another prime (818919929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409459961 + 409459962.

It is an arithmetic number, because the mean of its divisors is an integer number (409459962).

Almost surely, 2^818919923 is an apocalyptic number.

818919923 is a deficient number, since it is larger than the sum of its proper divisors (1).

818919923 is an equidigital number, since it uses as much as digits as its factorization.

818919923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 50.

The square root of 818919923 is about 28616.7769498943. The cubic root of 818919923 is about 935.5790299437.

The spelling of 818919923 in words is "eight hundred eighteen million, nine hundred nineteen thousand, nine hundred twenty-three".