12312281 has 2 divisors, whose sum is σ = 12312282. Its totient is φ = 12312280.

The previous prime is 12312277. The next prime is 12312283. The reversal of 12312281 is 18221321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7728400 + 4583881 = 2780^2 + 2141^2 .

It is a cyclic number.

It is not a de Polignac number, because 12312281 - 2² = 12312277 is a prime.

It is a super-2 number, since 2×12312281² = 303184526845922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 12312283, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12312283) 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, 6156140 + 6156141.

It is an arithmetic number, because the mean of its divisors is an integer number (6156141).

Almost surely, 2^12312281 is an apocalyptic number.

It is an amenable number.

12312281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312281 is an equidigital number, since it uses as much as digits as its factorization.

12312281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

The square root of 12312281 is about 3508.8860055579. The cubic root of 12312281 is about 230.9118245702.

The spelling of 12312281 in words is "twelve million, three hundred twelve thousand, two hundred eighty-one".