999905111 has 2 divisors, whose sum is σ = 999905112. Its totient is φ = 999905110.

The previous prime is 999905083. The next prime is 999905113. The reversal of 999905111 is 111509999.

It is a strong prime.

It is an emirp because it is prime and its reverse (111509999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999905111 is a prime.

Together with 999905113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999905113) 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, 499952555 + 499952556.

It is an arithmetic number, because the mean of its divisors is an integer number (499952556).

Almost surely, 2^999905111 is an apocalyptic number.

999905111 is a deficient number, since it is larger than the sum of its proper divisors (1).

999905111 is an equidigital number, since it uses as much as digits as its factorization.

999905111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32805, while the sum is 44.

The square root of 999905111 is about 31621.2762392665. The cubic root of 999905111 is about 999.9683693328.

The spelling of 999905111 in words is "nine hundred ninety-nine million, nine hundred five thousand, one hundred eleven".