12519509 has 2 divisors, whose sum is σ = 12519510. Its totient is φ = 12519508.

The previous prime is 12519487. The next prime is 12519511. The reversal of 12519509 is 90591521.

12519509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11242609 + 1276900 = 3353^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 12519509 - 2²⁰ = 11470933 is a prime.

Together with 12519511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12512509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6259754 + 6259755.

It is an arithmetic number, because the mean of its divisors is an integer number (6259755).

Almost surely, 2^12519509 is an apocalyptic number.

It is an amenable number.

12519509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12519509 is an equidigital number, since it uses as much as digits as its factorization.

12519509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 12519509 is about 3538.2918195084. The cubic root of 12519509 is about 232.2001159316.

The spelling of 12519509 in words is "twelve million, five hundred nineteen thousand, five hundred nine".