12271681 has 2 divisors, whose sum is σ = 12271682. Its totient is φ = 12271680.

The previous prime is 12271643. The next prime is 12271709. The reversal of 12271681 is 18617221.

12271681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (12271709) can be obtained adding 12271681 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11289600 + 982081 = 3360^2 + 991^2 .

It is a cyclic number.

It is not a de Polignac number, because 12271681 - 2¹⁵ = 12238913 is a prime.

It is a super-2 number, since 2×12271681² = 301188309131522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12271621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6135840 + 6135841.

It is an arithmetic number, because the mean of its divisors is an integer number (6135841).

Almost surely, 2^12271681 is an apocalyptic number.

It is an amenable number.

12271681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12271681 is an equidigital number, since it uses as much as digits as its factorization.

12271681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 12271681 is about 3503.0959164716. The cubic root of 12271681 is about 230.6577329097.

The spelling of 12271681 in words is "twelve million, two hundred seventy-one thousand, six hundred eighty-one".