111111388889 has 4 divisors (see below), whose sum is σ = 111112222224. Its totient is φ = 111110555556.

The previous prime is 111111388879. The next prime is 111111388891. The reversal of 111111388889 is 988883111111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111111388889 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (111111388849) 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, 166667 + ... + 500000.

It is an arithmetic number, because the mean of its divisors is an integer number (27778055556).

Almost surely, 2^111111388889 is an apocalyptic number.

It is an amenable number.

111111388889 is a deficient number, since it is larger than the sum of its proper divisors (833335).

111111388889 is an equidigital number, since it uses as much as digits as its factorization.

111111388889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833334.

The product of its digits is 110592, while the sum is 50.

The spelling of 111111388889 in words is "one hundred eleven billion, one hundred eleven million, three hundred eighty-eight thousand, eight hundred eighty-nine".