12271643 has 2 divisors, whose sum is σ = 12271644. Its totient is φ = 12271642.

The previous prime is 12271639. The next prime is 12271681. The reversal of 12271643 is 34617221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12271643 - 2² = 12271639 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12271613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6135821 + 6135822.

It is an arithmetic number, because the mean of its divisors is an integer number (6135822).

Almost surely, 2^12271643 is an apocalyptic number.

12271643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12271643 is an equidigital number, since it uses as much as digits as its factorization.

12271643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 12271643 is about 3503.0904926936. The cubic root of 12271643 is about 230.6574948276.

Adding to 12271643 its reverse (34617221), we get a palindrome (46888864).

The spelling of 12271643 in words is "twelve million, two hundred seventy-one thousand, six hundred forty-three".