12634434409 has 3 divisors (see below), whose sum is σ = 12634546813. Its totient is φ = 12634322006.

The previous prime is 12634434403. The next prime is 12634434419. The reversal of 12634434409 is 90443443621.

The square root of 12634434409 is 112403.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90443443621 = 115879 ⋅780499.

It is not a de Polignac number, because 12634434409 - 2²⁹ = 12097563497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12634434403) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 56202 + ... + 168604.

Almost surely, 2^12634434409 is an apocalyptic number.

12634434409 is the 112403-rd square number.

12634434409 is the 56202-nd centered octagonal number.

It is an amenable number.

12634434409 is a deficient number, since it is larger than the sum of its proper divisors (112404).

12634434409 is an frugal number, since it uses more digits than its factorization.

12634434409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224806 (or 112403 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 12634434409 in words is "twelve billion, six hundred thirty-four million, four hundred thirty-four thousand, four hundred nine".