13228474587409 has 3 divisors (see below), whose sum is σ = 13228478224507. Its totient is φ = 13228470950312.

The previous prime is 13228474587401. The next prime is 13228474587431. The reversal of 13228474587409 is 90478547482231.

The square root of 13228474587409 is 3637097.

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

13228474587409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 13056189822225 + 172284765184 = 3613335^2 + 415072^2 .

It is not a de Polignac number, because 13228474587409 - 2³ = 13228474587401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13228474587401) 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, 1818549 + ... + 5455645.

Almost surely, 2^{13228474587409} is an apocalyptic number.

13228474587409 is the 3637097-th square number.

13228474587409 is the 1818549-th centered octagonal number.

It is an amenable number.

13228474587409 is a deficient number, since it is larger than the sum of its proper divisors (3637098).

13228474587409 is an frugal number, since it uses more digits than its factorization.

13228474587409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7274194 (or 3637097 counting only the distinct ones).

The product of its (nonzero) digits is 108380160, while the sum is 64.

Multiplying 13228474587409 by its sum of digits (64), we get a square (846622373594176 = 29096776²).

The spelling of 13228474587409 in words is "thirteen trillion, two hundred twenty-eight billion, four hundred seventy-four million, five hundred eighty-seven thousand, four hundred nine".