12165281 has 2 divisors, whose sum is σ = 12165282. Its totient is φ = 12165280.

The previous prime is 12165277. The next prime is 12165287. The reversal of 12165281 is 18256121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10784656 + 1380625 = 3284^2 + 1175^2 .

It is a cyclic number.

It is not a de Polignac number, because 12165281 - 2² = 12165277 is a prime.

It is a super-2 number, since 2×12165281² = 295988123617922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12165281.

It is not a weakly prime, because it can be changed into another prime (12165287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6082640 + 6082641.

It is an arithmetic number, because the mean of its divisors is an integer number (6082641).

Almost surely, 2^12165281 is an apocalyptic number.

It is an amenable number.

12165281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12165281 is an equidigital number, since it uses as much as digits as its factorization.

12165281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 26.

The square root of 12165281 is about 3487.8762879437. The cubic root of 12165281 is about 229.9891677318.

The spelling of 12165281 in words is "twelve million, one hundred sixty-five thousand, two hundred eighty-one".