12312011 has 2 divisors, whose sum is σ = 12312012. Its totient is φ = 12312010.

The previous prime is 12311989. The next prime is 12312017. The reversal of 12312011 is 11021321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12312011 is a prime.

It is a super-2 number, since 2×12312011² = 303171229728242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12311983 and 12312001.

It is not a weakly prime, because it can be changed into another prime (12312017) 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, 6156005 + 6156006.

It is an arithmetic number, because the mean of its divisors is an integer number (6156006).

Almost surely, 2^12312011 is an apocalyptic number.

12312011 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312011 is an equidigital number, since it uses as much as digits as its factorization.

12312011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 12312011 is about 3508.8475315978. The cubic root of 12312011 is about 230.9101366445.

Adding to 12312011 its reverse (11021321), we get a palindrome (23333332).

The spelling of 12312011 in words is "twelve million, three hundred twelve thousand, eleven".