12867509 has 2 divisors, whose sum is σ = 12867510. Its totient is φ = 12867508.

The previous prime is 12867497. The next prime is 12867577. The reversal of 12867509 is 90576821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9591409 + 3276100 = 3097^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 12867509 - 2⁴ = 12867493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12867209) 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 as a sum of consecutive naturals, namely, 6433754 + 6433755.

It is an arithmetic number, because the mean of its divisors is an integer number (6433755).

Almost surely, 2^12867509 is an apocalyptic number.

It is an amenable number.

12867509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12867509 is an equidigital number, since it uses as much as digits as its factorization.

12867509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 12867509 is about 3587.1310263217. The cubic root of 12867509 is about 234.3319430001.

The spelling of 12867509 in words is "twelve million, eight hundred sixty-seven thousand, five hundred nine".