1312120812 has 12 divisors (see below), whose sum is σ = 3061615256. Its totient is φ = 437373600.

The previous prime is 1312120801. The next prime is 1312120819. The reversal of 1312120812 is 2180212131.

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

It is a super-2 number, since 2×1312120812² = 3443322050567078688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312120819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54671689 + ... + 54671712.

Almost surely, 2^1312120812 is an apocalyptic number.

1312120812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1312120812 is an abundant number, since it is smaller than the sum of its proper divisors (1749494444).

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

1312120812 is a wasteful number, since it uses less digits than its factorization.

1312120812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109343408 (or 109343406 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1312120812 is about 36223.2081958515. The cubic root of 1312120812 is about 1094.7743360162.

Adding to 1312120812 its reverse (2180212131), we get a palindrome (3492332943).

It can be divided in two parts, 13121 and 20812, that added together give a palindrome (33933).

The spelling of 1312120812 in words is "one billion, three hundred twelve million, one hundred twenty thousand, eight hundred twelve".