12215543 has 2 divisors, whose sum is σ = 12215544. Its totient is φ = 12215542.

The previous prime is 12215531. The next prime is 12215557. The reversal of 12215543 is 34551221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12215543 - 2⁴ = 12215527 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12215573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6107771 + 6107772.

It is an arithmetic number, because the mean of its divisors is an integer number (6107772).

Almost surely, 2^12215543 is an apocalyptic number.

12215543 is a deficient number, since it is larger than the sum of its proper divisors (1).

12215543 is an equidigital number, since it uses as much as digits as its factorization.

12215543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 23.

The square root of 12215543 is about 3495.0741050799. The cubic root of 12215543 is about 230.3054731251.

Adding to 12215543 its reverse (34551221), we get a palindrome (46766764).

The spelling of 12215543 in words is "twelve million, two hundred fifteen thousand, five hundred forty-three".