111111311 has 4 divisors (see below), whose sum is σ = 111609792. Its totient is φ = 110612832.

The previous prime is 111111293. The next prime is 111111313. The reversal of 111111311 is 113111111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113111111 = 139 ⋅813749.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111111311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111292 and 111111301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248906 + ... + 249351.

It is an arithmetic number, because the mean of its divisors is an integer number (27902448).

Almost surely, 2^111111311 is an apocalyptic number.

111111311 is a deficient number, since it is larger than the sum of its proper divisors (498481).

111111311 is an equidigital number, since it uses as much as digits as its factorization.

111111311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498480.

The product of its digits is 3, while the sum is 11.

The square root of 111111311 is about 10540.9350154529. The cubic root of 111111311 is about 480.7501450586.

Adding to 111111311 its reverse (113111111), we get a palindrome (224222422).

It can be divided in two parts, 1111 and 11311, that multiplied together give a palindrome (12566521).

The spelling of 111111311 in words is "one hundred eleven million, one hundred eleven thousand, three hundred eleven".