12543109 has 8 divisors (see below), whose sum is σ = 13016160. Its totient is φ = 12072816.

The previous prime is 12543107. The next prime is 12543121. The reversal of 12543109 is 90134521.

12543109 is nontrivially palindromic in base 11.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12543109 - 2¹ = 12543107 is a prime.

It is a super-3 number, since 3×12543109³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543103) 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 7 ways as a sum of consecutive naturals, for example, 14754 + ... + 15580.

It is an arithmetic number, because the mean of its divisors is an integer number (1627020).

Almost surely, 2^12543109 is an apocalyptic number.

It is an amenable number.

12543109 is a deficient number, since it is larger than the sum of its proper divisors (473051).

12543109 is an equidigital number, since it uses as much as digits as its factorization.

12543109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 12543109 is about 3541.6251919140. The cubic root of 12543109 is about 232.3459279069.

It can be divided in two parts, 125 and 43109, that added together give a palindrome (43234).

The spelling of 12543109 in words is "twelve million, five hundred forty-three thousand, one hundred nine".