12543123 has 4 divisors (see below), whose sum is σ = 16724168. Its totient is φ = 8362080.

The previous prime is 12543121. The next prime is 12543131. The reversal of 12543123 is 32134521.

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

It is not a de Polignac number, because 12543123 - 2¹ = 12543121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12543123.

It is not an unprimeable number, because it can be changed into a prime (12543121) 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, 2090518 + ... + 2090523.

It is an arithmetic number, because the mean of its divisors is an integer number (4181042).

Almost surely, 2^12543123 is an apocalyptic number.

12543123 is a deficient number, since it is larger than the sum of its proper divisors (4181045).

12543123 is an equidigital number, since it uses as much as digits as its factorization.

12543123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4181044.

The product of its digits is 720, while the sum is 21.

The square root of 12543123 is about 3541.6271684072. The cubic root of 12543123 is about 232.3460143512.

Adding to 12543123 its reverse (32134521), we get a palindrome (44677644).

The spelling of 12543123 in words is "twelve million, five hundred forty-three thousand, one hundred twenty-three".