111212311 has 6 divisors (see below), whose sum is σ = 129369480. Its totient is φ = 95324796.

The previous prime is 111212287. The next prime is 111212323. The reversal of 111212311 is 113212111.

It is a happy number.

It is not a de Polignac number, because 111212311 - 2⁹ = 111211799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212291 and 111212300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134771 + ... + 1134868.

It is an arithmetic number, because the mean of its divisors is an integer number (21561580).

Almost surely, 2^111212311 is an apocalyptic number.

111212311 is a deficient number, since it is larger than the sum of its proper divisors (18157169).

111212311 is an equidigital number, since it uses as much as digits as its factorization.

111212311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269653 (or 2269646 counting only the distinct ones).

The product of its digits is 12, while the sum is 13.

The square root of 111212311 is about 10545.7247735753. The cubic root of 111212311 is about 480.8957679758.

Adding to 111212311 its reverse (113212111), we get a palindrome (224424422).

The spelling of 111212311 in words is "one hundred eleven million, two hundred twelve thousand, three hundred eleven".