13178351209 has 3 divisors (see below), whose sum is σ = 13178466007. Its totient is φ = 13178236412.

The previous prime is 13178351149. The next prime is 13178351279. The reversal of 13178351209 is 90215387131.

The square root of 13178351209 is 114797.

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.

It can be written as a sum of positive squares in only one way, i.e., 895505625 + 12282845584 = 29925^2 + 110828^2 .

It is not a de Polignac number, because 13178351209 - 2²⁷ = 13044133481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13178351279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 57399 + ... + 172195.

Almost surely, 2^13178351209 is an apocalyptic number.

13178351209 is the 114797-th square number.

13178351209 is the 57399-th centered octagonal number.

It is an amenable number.

13178351209 is a deficient number, since it is larger than the sum of its proper divisors (114798).

13178351209 is an frugal number, since it uses more digits than its factorization.

13178351209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229594 (or 114797 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 13178351209 in words is "thirteen billion, one hundred seventy-eight million, three hundred fifty-one thousand, two hundred nine".