12543129 has 6 divisors (see below), whose sum is σ = 18117866. Its totient is φ = 8362080.

The previous prime is 12543121. The next prime is 12543131. The reversal of 12543129 is 92134521.

It can be written as a sum of positive squares in only one way, i.e., 11209104 + 1334025 = 3348^2 + 1155^2 .

It is not a de Polignac number, because 12543129 - 2³ = 12543121 is a prime.

It is a super-2 number, since 2×12543129² = 314660170221282, which contains 22 as substring.

It is a Duffinian number.

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 5 ways as a sum of consecutive naturals, for example, 696832 + ... + 696849.

Almost surely, 2^12543129 is an apocalyptic number.

It is an amenable number.

12543129 is a deficient number, since it is larger than the sum of its proper divisors (5574737).

12543129 is a wasteful number, since it uses less digits than its factorization.

12543129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393687 (or 1393684 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 12543129 is about 3541.6280154754. The cubic root of 12543129 is about 232.3460513988.

The spelling of 12543129 in words is "twelve million, five hundred forty-three thousand, one hundred twenty-nine".