126513752509 has 2 divisors, whose sum is σ = 126513752510. Its totient is φ = 126513752508.

The previous prime is 126513752489. The next prime is 126513752549. The reversal of 126513752509 is 905257315621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69403268025 + 57110484484 = 263445^2 + 238978^2 .

It is a cyclic number.

It is not a de Polignac number, because 126513752509 - 2²⁵ = 126480198077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126513752549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63256876254 + 63256876255.

It is an arithmetic number, because the mean of its divisors is an integer number (63256876255).

Almost surely, 2^126513752509 is an apocalyptic number.

It is an amenable number.

126513752509 is a deficient number, since it is larger than the sum of its proper divisors (1).

126513752509 is an equidigital number, since it uses as much as digits as its factorization.

126513752509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567000, while the sum is 46.

The spelling of 126513752509 in words is "one hundred twenty-six billion, five hundred thirteen million, seven hundred fifty-two thousand, five hundred nine".