12312023531 has 2 divisors, whose sum is σ = 12312023532. Its totient is φ = 12312023530.

The previous prime is 12312023513. The next prime is 12312023557. The reversal of 12312023531 is 13532021321.

Together with previous prime (12312023513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12312023531 - 2¹⁸ = 12311761387 is a prime.

It is a super-2 number, since 2×12312023531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12312023497 and 12312023506.

It is not a weakly prime, because it can be changed into another prime (12312023501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156011765 + 6156011766.

It is an arithmetic number, because the mean of its divisors is an integer number (6156011766).

Almost surely, 2^12312023531 is an apocalyptic number.

12312023531 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312023531 is an equidigital number, since it uses as much as digits as its factorization.

12312023531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 12312023531 its reverse (13532021321), we get a palindrome (25844044852).

The spelling of 12312023531 in words is "twelve billion, three hundred twelve million, twenty-three thousand, five hundred thirty-one".