12315643 has 2 divisors, whose sum is σ = 12315644. Its totient is φ = 12315642.

The previous prime is 12315631. The next prime is 12315647. The reversal of 12315643 is 34651321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12315643 - 2⁹ = 12315131 is a prime.

It is not a weakly prime, because it can be changed into another prime (12315647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6157821 + 6157822.

It is an arithmetic number, because the mean of its divisors is an integer number (6157822).

Almost surely, 2^12315643 is an apocalyptic number.

12315643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12315643 is an equidigital number, since it uses as much as digits as its factorization.

12315643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 12315643 is about 3509.3650422833. The cubic root of 12315643 is about 230.9328403052.

Adding to 12315643 its reverse (34651321), we get a palindrome (46966964).

The spelling of 12315643 in words is "twelve million, three hundred fifteen thousand, six hundred forty-three".