1311121112 has 16 divisors (see below), whose sum is σ = 2809545360. Its totient is φ = 561909024.

The previous prime is 1311121111. The next prime is 1311121153. The reversal of 1311121112 is 2111211131.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311121111) 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, 11706383 + ... + 11706494.

It is an arithmetic number, because the mean of its divisors is an integer number (175596585).

Almost surely, 2^1311121112 is an apocalyptic number.

It is an amenable number.

1311121112 is an abundant number, since it is smaller than the sum of its proper divisors (1498424248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311121112 is a wasteful number, since it uses less digits than its factorization.

1311121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23412890 (or 23412886 counting only the distinct ones).

The product of its digits is 12, while the sum is 14.

The square root of 1311121112 is about 36209.4064022044. The cubic root of 1311121112 is about 1094.4962305341.

Adding to 1311121112 its reverse (2111211131), we get a palindrome (3422332243).

It can be divided in two parts, 1 and 311121112, that added together give a palindrome (311121113).

The spelling of 1311121112 in words is "one billion, three hundred eleven million, one hundred twenty-one thousand, one hundred twelve".