1231511212312 has 16 divisors (see below), whose sum is σ = 2309104981800. Its totient is φ = 615749883840.

The previous prime is 1231511212297. The next prime is 1231511212363. The reversal of 1231511212312 is 2132121151321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280987 + ... + 1594357.

Almost surely, 2^{1231511212312} is an apocalyptic number.

It is an amenable number.

1231511212312 is a deficient number, since it is larger than the sum of its proper divisors (1077593769488).

1231511212312 is a wasteful number, since it uses less digits than its factorization.

1231511212312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430586 (or 1430582 counting only the distinct ones).

The product of its digits is 720, while the sum is 25.

Adding to 1231511212312 its reverse (2132121151321), we get a palindrome (3363632363633).

The spelling of 1231511212312 in words is "one trillion, two hundred thirty-one billion, five hundred eleven million, two hundred twelve thousand, three hundred twelve".