12273281 has 2 divisors, whose sum is σ = 12273282. Its totient is φ = 12273280.

The previous prime is 12273277. The next prime is 12273299. The reversal of 12273281 is 18237221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 774400 = 3391^2 + 880^2 .

It is an emirp because it is prime and its reverse (18237221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12273281 - 2² = 12273277 is a prime.

It is a super-2 number, since 2×12273281² = 301266853009922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12273281.

It is not a weakly prime, because it can be changed into another prime (12273181) 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, 6136640 + 6136641.

It is an arithmetic number, because the mean of its divisors is an integer number (6136641).

Almost surely, 2^12273281 is an apocalyptic number.

It is an amenable number.

12273281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12273281 is an equidigital number, since it uses as much as digits as its factorization.

12273281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 12273281 is about 3503.3242784533. The cubic root of 12273281 is about 230.6677569734.

The spelling of 12273281 in words is "twelve million, two hundred seventy-three thousand, two hundred eighty-one".