1231042543012 has 24 divisors (see below), whose sum is σ = 2285427697560. Its totient is φ = 578202193920.

The previous prime is 1231042542959. The next prime is 1231042543013. The reversal of 1231042543012 is 2103452401321.

It can be written as a sum of positive squares in 4 ways, for example, as 135369541476 + 1095673001536 = 367926^2 + 1046744^2 .

It is not an unprimeable number, because it can be changed into a prime (1231042543013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17338437 + ... + 17409292.

It is an arithmetic number, because the mean of its divisors is an integer number (95226154065).

Almost surely, 2^{1231042543012} is an apocalyptic number.

It is an amenable number.

1231042543012 is a deficient number, since it is larger than the sum of its proper divisors (1054385154548).

1231042543012 is a wasteful number, since it uses less digits than its factorization.

1231042543012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34748271 (or 34748269 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 1231042543012 its reverse (2103452401321), we get a palindrome (3334494944333).

The spelling of 1231042543012 in words is "one trillion, two hundred thirty-one billion, forty-two million, five hundred forty-three thousand, twelve".