12009913 has 4 divisors (see below), whose sum is σ = 12021028. Its totient is φ = 11998800.

The previous prime is 12009901. The next prime is 12009917. The reversal of 12009913 is 31990021.

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 2 ways, for example, as 6017209 + 5992704 = 2453^2 + 2448^2 .

It is a cyclic number.

It is not a de Polignac number, because 12009913 - 2²¹ = 9912761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12009917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3738 + ... + 6163.

It is an arithmetic number, because the mean of its divisors is an integer number (3005257).

Almost surely, 2^12009913 is an apocalyptic number.

It is an amenable number.

12009913 is a deficient number, since it is larger than the sum of its proper divisors (11115).

12009913 is an equidigital number, since it uses as much as digits as its factorization.

12009913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11114.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 12009913 is about 3465.5321380706. The cubic root of 12009913 is about 229.0058731165.

Adding to 12009913 its reverse (31990021), we get a palindrome (43999934).

The spelling of 12009913 in words is "twelve million, nine thousand, nine hundred thirteen".