999818111 has 2 divisors, whose sum is σ = 999818112. Its totient is φ = 999818110.

The previous prime is 999818081. The next prime is 999818173. The reversal of 999818111 is 111818999.

It is a weak prime.

It is an emirp because it is prime and its reverse (111818999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999818111 - 2¹⁸ = 999555967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999818311) 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, 499909055 + 499909056.

It is an arithmetic number, because the mean of its divisors is an integer number (499909056).

Almost surely, 2^999818111 is an apocalyptic number.

999818111 is a deficient number, since it is larger than the sum of its proper divisors (1).

999818111 is an equidigital number, since it uses as much as digits as its factorization.

999818111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 47.

The square root of 999818111 is about 31619.9005532908. The cubic root of 999818111 is about 999.9393666570.

The spelling of 999818111 in words is "nine hundred ninety-nine million, eight hundred eighteen thousand, one hundred eleven".