311112122111 has 4 divisors (see below), whose sum is σ = 355556710992. Its totient is φ = 266667533232.

The previous prime is 311112122093. The next prime is 311112122129. The reversal of 311112122111 is 111221211113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111221211113 = 23 ⋅4835704831.

It is an interprime number because it is at equal distance from previous prime (311112122093) and next prime (311112122129).

It is a cyclic number.

It is not a de Polignac number, because 311112122111 - 2²² = 311107927807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311112122111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311112122131) 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, 22222294430 + ... + 22222294443.

It is an arithmetic number, because the mean of its divisors is an integer number (88889177748).

Almost surely, 2^311112122111 is an apocalyptic number.

311112122111 is a deficient number, since it is larger than the sum of its proper divisors (44444588881).

311112122111 is an equidigital number, since it uses as much as digits as its factorization.

311112122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44444588880.

The product of its digits is 24, while the sum is 17.

Adding to 311112122111 its reverse (111221211113), we get a palindrome (422333333224).

The spelling of 311112122111 in words is "three hundred eleven billion, one hundred twelve million, one hundred twenty-two thousand, one hundred eleven".