12581209 has 3 divisors (see below), whose sum is σ = 12584757. Its totient is φ = 12577662.

The previous prime is 12581183. The next prime is 12581227. The reversal of 12581209 is 90218521.

The square root of 12581209 is 3547.

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

12581209 is digitally balanced in base 3, 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 is not a de Polignac number, because 12581209 - 2²¹ = 10484057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12581269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1774 + ... + 5320.

It is an arithmetic number, because the mean of its divisors is an integer number (4194919).

Almost surely, 2^12581209 is an apocalyptic number.

12581209 is the 3547-th square number.

12581209 is the 1774-th centered octagonal number.

It is an amenable number.

12581209 is a deficient number, since it is larger than the sum of its proper divisors (3548).

12581209 is an frugal number, since it uses more digits than its factorization.

12581209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7094 (or 3547 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The cubic root of 12581209 is about 232.5809422573.

The spelling of 12581209 in words is "twelve million, five hundred eighty-one thousand, two hundred nine".