999992111 has 2 divisors, whose sum is σ = 999992112. Its totient is φ = 999992110.

The previous prime is 999992107. The next prime is 999992129. The reversal of 999992111 is 111299999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999992111 - 2² = 999992107 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999992111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999992101) 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, 499996055 + 499996056.

It is an arithmetic number, because the mean of its divisors is an integer number (499996056).

Almost surely, 2^999992111 is an apocalyptic number.

999992111 is a deficient number, since it is larger than the sum of its proper divisors (1).

999992111 is an equidigital number, since it uses as much as digits as its factorization.

999992111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 118098, while the sum is 50.

The square root of 999992111 is about 31622.6518653955. The cubic root of 999992111 is about 999.9973703264.

The spelling of 999992111 in words is "nine hundred ninety-nine million, nine hundred ninety-two thousand, one hundred eleven".