126512609 has 2 divisors, whose sum is σ = 126512610. Its totient is φ = 126512608.

The previous prime is 126512599. The next prime is 126512629. The reversal of 126512609 is 906215621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92698384 + 33814225 = 9628^2 + 5815^2 .

It is a cyclic number.

It is not a de Polignac number, because 126512609 - 2²⁰ = 125464033 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (126512629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63256304 + 63256305.

It is an arithmetic number, because the mean of its divisors is an integer number (63256305).

Almost surely, 2^126512609 is an apocalyptic number.

It is an amenable number.

126512609 is a deficient number, since it is larger than the sum of its proper divisors (1).

126512609 is an equidigital number, since it uses as much as digits as its factorization.

126512609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 126512609 is about 11247.7824036563. The cubic root of 126512609 is about 502.0087311910.

The spelling of 126512609 in words is "one hundred twenty-six million, five hundred twelve thousand, six hundred nine".