12526509 has 4 divisors (see below), whose sum is σ = 16702016. Its totient is φ = 8351004.

The previous prime is 12526489. The next prime is 12526517. The reversal of 12526509 is 90562521.

It is a happy number.

12526509 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 Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12526509 - 2¹² = 12522413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12526589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087749 + ... + 2087754.

It is an arithmetic number, because the mean of its divisors is an integer number (4175504).

Almost surely, 2^12526509 is an apocalyptic number.

It is an amenable number.

12526509 is a deficient number, since it is larger than the sum of its proper divisors (4175507).

12526509 is an equidigital number, since it uses as much as digits as its factorization.

12526509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175506.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 12526509 is about 3539.2808591577. The cubic root of 12526509 is about 232.2433843476.

The spelling of 12526509 in words is "twelve million, five hundred twenty-six thousand, five hundred nine".