1231112311 has 16 divisors (see below), whose sum is σ = 1448028288. Its totient is φ = 1031896800.

The previous prime is 1231112293. The next prime is 1231112327. The reversal of 1231112311 is 1132111321.

It is a happy number.

It is not a de Polignac number, because 1231112311 - 2²⁷ = 1096894583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231112111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130876 + ... + 139966.

It is an arithmetic number, because the mean of its divisors is an integer number (90501768).

Almost surely, 2^1231112311 is an apocalyptic number.

1231112311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231112311 is a deficient number, since it is larger than the sum of its proper divisors (216915977).

1231112311 is a wasteful number, since it uses less digits than its factorization.

1231112311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10062.

The product of its digits is 36, while the sum is 16.

The square root of 1231112311 is about 35087.2100771777. The cubic root of 1231112311 is about 1071.7641468838.

Adding to 1231112311 its reverse (1132111321), we get a palindrome (2363223632).

The spelling of 1231112311 in words is "one billion, two hundred thirty-one million, one hundred twelve thousand, three hundred eleven".