1311312012 has 12 divisors (see below), whose sum is σ = 3059728056. Its totient is φ = 437104000.

The previous prime is 1311311977. The next prime is 1311312043. The reversal of 1311312012 is 2102131131.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1311311982 and 1311312000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54637989 + ... + 54638012.

It is an arithmetic number, because the mean of its divisors is an integer number (254977338).

Almost surely, 2^1311312012 is an apocalyptic number.

1311312012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1311312012 is an abundant number, since it is smaller than the sum of its proper divisors (1748416044).

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

1311312012 is a wasteful number, since it uses less digits than its factorization.

1311312012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109276008 (or 109276006 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311312012 is about 36212.0423616233. The cubic root of 1311312012 is about 1094.5493477198.

Adding to 1311312012 its reverse (2102131131), we get a palindrome (3413443143).

The spelling of 1311312012 in words is "one billion, three hundred eleven million, three hundred twelve thousand, twelve".