12543331 has 4 divisors (see below), whose sum is σ = 13281192. Its totient is φ = 11805472.

The previous prime is 12543329. The next prime is 12543337. The reversal of 12543331 is 13334521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12543331 - 2¹ = 12543329 is a prime.

It is a super-2 number, since 2×12543331² = 314670305151122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12543337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368905 + ... + 368938.

It is an arithmetic number, because the mean of its divisors is an integer number (3320298).

Almost surely, 2^12543331 is an apocalyptic number.

12543331 is a deficient number, since it is larger than the sum of its proper divisors (737861).

12543331 is an equidigital number, since it uses as much as digits as its factorization.

12543331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737860.

The product of its digits is 1080, while the sum is 22.

The square root of 12543331 is about 3541.6565333188. The cubic root of 12543331 is about 232.3472986594.

Adding to 12543331 its reverse (13334521), we get a palindrome (25877852).

The spelling of 12543331 in words is "twelve million, five hundred forty-three thousand, three hundred thirty-one".