989999999111 has 4 divisors (see below), whose sum is σ = 990068050224. Its totient is φ = 989931948000.

The previous prime is 989999999101. The next prime is 989999999137. The reversal of 989999999111 is 111999999989.

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 989999999111 - 2¹⁰ = 989999998087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989999999111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989999999101) 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, 34003730 + ... + 34032831.

It is an arithmetic number, because the mean of its divisors is an integer number (247517012556).

Almost surely, 2^989999999111 is an apocalyptic number.

989999999111 is a deficient number, since it is larger than the sum of its proper divisors (68051113).

989999999111 is a wasteful number, since it uses less digits than its factorization.

989999999111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68051112.

The product of its digits is 344373768, while the sum is 83.

The spelling of 989999999111 in words is "nine hundred eighty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, one hundred eleven".