12331212991 has 2 divisors, whose sum is σ = 12331212992. Its totient is φ = 12331212990.

The previous prime is 12331212961. The next prime is 12331213051. The reversal of 12331212991 is 19921213321.

It is a weak prime.

It is an emirp because it is prime and its reverse (19921213321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12331212991 - 2²⁵ = 12297658559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12331212941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6165606495 + 6165606496.

It is an arithmetic number, because the mean of its divisors is an integer number (6165606496).

Almost surely, 2^12331212991 is an apocalyptic number.

12331212991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12331212991 is an equidigital number, since it uses as much as digits as its factorization.

12331212991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 34.

The spelling of 12331212991 in words is "twelve billion, three hundred thirty-one million, two hundred twelve thousand, nine hundred ninety-one".