12311111 has 12 divisors (see below), whose sum is σ = 13409760. Its totient is φ = 11293440.

The previous prime is 12311093. The next prime is 12311113. The reversal of 12311111 is 11111321.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12311111 is a prime.

It is a Duffinian number.

12311111 is a modest number, since divided by 11111 gives 123 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 12311092 and 12311101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11330 + ... + 12368.

It is an arithmetic number, because the mean of its divisors is an integer number (1117480).

Almost surely, 2^12311111 is an apocalyptic number.

12311111 is a deficient number, since it is larger than the sum of its proper divisors (1098649).

12311111 is a wasteful number, since it uses less digits than its factorization.

12311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114 (or 1097 counting only the distinct ones).

The product of its digits is 6, while the sum is 11.

The square root of 12311111 is about 3508.7192820173. The cubic root of 12311111 is about 230.9045100471.

Adding to 12311111 its reverse (11111321), we get a palindrome (23422432).

The spelling of 12311111 in words is "twelve million, three hundred eleven thousand, one hundred eleven".