12015643 has 2 divisors, whose sum is σ = 12015644. Its totient is φ = 12015642.

The previous prime is 12015613. The next prime is 12015649. The reversal of 12015643 is 34651021.

It is a strong prime.

It is an emirp because it is prime and its reverse (34651021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12015643 - 2⁵ = 12015611 is a prime.

It is not a weakly prime, because it can be changed into another prime (12015649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6007821 + 6007822.

It is an arithmetic number, because the mean of its divisors is an integer number (6007822).

Almost surely, 2^12015643 is an apocalyptic number.

12015643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12015643 is an equidigital number, since it uses as much as digits as its factorization.

12015643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 12015643 is about 3466.3587523509. The cubic root of 12015643 is about 229.0422873414.

Adding to 12015643 its reverse (34651021), we get a palindrome (46666664).

The spelling of 12015643 in words is "twelve million, fifteen thousand, six hundred forty-three".