12546115409 has 2 divisors, whose sum is σ = 12546115410. Its totient is φ = 12546115408.

The previous prime is 12546115349. The next prime is 12546115429. The reversal of 12546115409 is 90451164521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9456979009 + 3089136400 = 97247^2 + 55580^2 .

It is a cyclic number.

It is not a de Polignac number, because 12546115409 - 2¹² = 12546111313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12546115429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6273057704 + 6273057705.

It is an arithmetic number, because the mean of its divisors is an integer number (6273057705).

Almost surely, 2^12546115409 is an apocalyptic number.

It is an amenable number.

12546115409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12546115409 is an equidigital number, since it uses as much as digits as its factorization.

12546115409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 12546115409 in words is "twelve billion, five hundred forty-six million, one hundred fifteen thousand, four hundred nine".