99811111 has 4 divisors (see below), whose sum is σ = 99861112. Its totient is φ = 99761112.

The previous prime is 99811093. The next prime is 99811121. The reversal of 99811111 is 11111899.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99811111 - 2⁵ = 99811079 is a prime.

It is a Duffinian number.

99811111 is a modest number, since divided by 11111 gives 998 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99811121) 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 in 3 ways as a sum of consecutive naturals, for example, 21876 + ... + 26041.

It is an arithmetic number, because the mean of its divisors is an integer number (24965278).

Almost surely, 2^99811111 is an apocalyptic number.

99811111 is a deficient number, since it is larger than the sum of its proper divisors (50001).

99811111 is a wasteful number, since it uses less digits than its factorization.

99811111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50000.

The product of its digits is 648, while the sum is 31.

The square root of 99811111 is about 9990.5510859011. The cubic root of 99811111 is about 463.8664508019.

The spelling of 99811111 in words is "ninety-nine million, eight hundred eleven thousand, one hundred eleven".