12158543 has 4 divisors (see below), whose sum is σ = 12364680. Its totient is φ = 11952408.

The previous prime is 12158539. The next prime is 12158561. The reversal of 12158543 is 34585121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34585121 = 37 ⋅934733.

It is a cyclic number.

It is not a de Polignac number, because 12158543 - 2² = 12158539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12158563) 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 in 3 ways as a sum of consecutive naturals, for example, 102980 + ... + 103097.

It is an arithmetic number, because the mean of its divisors is an integer number (3091170).

Almost surely, 2^12158543 is an apocalyptic number.

12158543 is a deficient number, since it is larger than the sum of its proper divisors (206137).

12158543 is an equidigital number, since it uses as much as digits as its factorization.

12158543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206136.

The product of its digits is 4800, while the sum is 29.

The square root of 12158543 is about 3486.9102368716. The cubic root of 12158543 is about 229.9466984236.

The spelling of 12158543 in words is "twelve million, one hundred fifty-eight thousand, five hundred forty-three".