12331031981 has 2 divisors, whose sum is σ = 12331031982. Its totient is φ = 12331031980.

The previous prime is 12331031941. The next prime is 12331032011. The reversal of 12331031981 is 18913013321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11606614756 + 724417225 = 107734^2 + 26915^2 .

It is a cyclic number.

It is not a de Polignac number, because 12331031981 - 2⁶ = 12331031917 is a prime.

It is a super-2 number, since 2×12331031981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12331031941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6165515990 + 6165515991.

It is an arithmetic number, because the mean of its divisors is an integer number (6165515991).

Almost surely, 2^12331031981 is an apocalyptic number.

It is an amenable number.

12331031981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12331031981 is an equidigital number, since it uses as much as digits as its factorization.

12331031981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 12331031981 in words is "twelve billion, three hundred thirty-one million, thirty-one thousand, nine hundred eighty-one".