12541809 has 32 divisors (see below), whose sum is σ = 19869696. Its totient is φ = 6888960.

The previous prime is 12541799. The next prime is 12541811. The reversal of 12541809 is 90814521.

It is a happy number.

It is not a de Polignac number, because 12541809 - 2¹² = 12537713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12541819) 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 31 ways as a sum of consecutive naturals, for example, 95674 + ... + 95804.

It is an arithmetic number, because the mean of its divisors is an integer number (620928).

Almost surely, 2^12541809 is an apocalyptic number.

It is an amenable number.

12541809 is a deficient number, since it is larger than the sum of its proper divisors (7327887).

12541809 is a wasteful number, since it uses less digits than its factorization.

12541809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 12541809 is about 3541.4416555973. The cubic root of 12541809 is about 232.3379006536.

The spelling of 12541809 in words is "twelve million, five hundred forty-one thousand, eight hundred nine".