12312561731 has 2 divisors, whose sum is σ = 12312561732. Its totient is φ = 12312561730.

The previous prime is 12312561727. The next prime is 12312561739. The reversal of 12312561731 is 13716521321.

12312561731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (13716521321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12312561731 - 2² = 12312561727 is a prime.

It is a super-2 number, since 2×12312561731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12312561739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156280865 + 6156280866.

It is an arithmetic number, because the mean of its divisors is an integer number (6156280866).

Almost surely, 2^12312561731 is an apocalyptic number.

12312561731 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312561731 is an equidigital number, since it uses as much as digits as its factorization.

12312561731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The spelling of 12312561731 in words is "twelve billion, three hundred twelve million, five hundred sixty-one thousand, seven hundred thirty-one".