12311333231 has 2 divisors, whose sum is σ = 12311333232.
Its totient is φ = 12311333230.
The previous prime is 12311333197. The next prime is 12311333249. The reversal of 12311333231 is 13233311321.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 12311333231 - 222 = 12307138927 is a prime.
It is a super-2 number, since 2×123113332312 (a number of 21 digits) contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 12311333197 and 12311333206.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12311333731) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155666615 + 6155666616.
It is an arithmetic number, because the mean of its divisors is an integer number (6155666616).
Almost surely, 212311333231 is an apocalyptic number.
12311333231 is a deficient number, since it is larger than the sum of its proper divisors (1).
12311333231 is an equidigital number, since it uses as much as digits as its factorization.
12311333231 is an evil number, because the sum of its binary digits is even.
The product of its digits is 972, while the sum is 23.
Adding to 12311333231 its reverse (13233311321), we get a palindrome (25544644552).
The spelling of 12311333231 in words is "twelve billion, three hundred eleven million, three hundred thirty-three thousand, two hundred thirty-one".