99111 has 4 divisors (see below), whose sum is σ = 132152. Its totient is φ = 66072.

The previous prime is 99109. The next prime is 99119. The reversal of 99111 is 11199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11199 = 3 ⋅3733.

It is not a de Polignac number, because 99111 - 2¹ = 99109 is a prime.

It is a D-number.

It is a Duffinian number.

99111 is a modest number, since divided by 111 gives 99 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16516 + ... + 16521.

It is an arithmetic number, because the mean of its divisors is an integer number (33038).

2⁹⁹¹¹¹ is an apocalyptic number.

99111 is a deficient number, since it is larger than the sum of its proper divisors (33041).

99111 is a wasteful number, since it uses less digits than its factorization.

99111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33040.

The product of its digits is 81, while the sum is 21.

The square root of 99111 is about 314.8189956149. The cubic root of 99111 is about 46.2779329681.

It can be divided in two parts, 991 and 11, that multiplied together give a palindrome (10901).

The spelling of 99111 in words is "ninety-nine thousand, one hundred eleven".