9999111 has 24 divisors (see below), whose sum is σ = 14932480. Its totient is φ = 5933952.

The previous prime is 9999083. The next prime is 9999161. The reversal of 9999111 is 1119999.

It is not a de Polignac number, because 9999111 - 2⁶ = 9999047 is a prime.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9999111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16170 + ... + 16776.

Almost surely, 2^9999111 is an apocalyptic number.

9999111 is a deficient number, since it is larger than the sum of its proper divisors (4933369).

9999111 is a wasteful number, since it uses less digits than its factorization.

9999111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 646 counting only the distinct ones).

The product of its digits is 6561, while the sum is 39.

The square root of 9999111 is about 3162.1370938022. The cubic root of 9999111 is about 215.4370845059.

It can be divided in two parts, 99991 and 11, that multiplied together give a palindrome (1099901).

The spelling of 9999111 in words is "nine million, nine hundred ninety-nine thousand, one hundred eleven".