1245424113509 has 2 divisors, whose sum is σ = 1245424113510. Its totient is φ = 1245424113508.

The previous prime is 1245424113503. The next prime is 1245424113529. The reversal of 1245424113509 is 9053114245421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 935756349025 + 309667764484 = 967345^2 + 556478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245424113509 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 (1245424113503) 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, 622712056754 + 622712056755.

It is an arithmetic number, because the mean of its divisors is an integer number (622712056755).

Almost surely, 2^{1245424113509} is an apocalyptic number.

It is an amenable number.

1245424113509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245424113509 is an equidigital number, since it uses as much as digits as its factorization.

1245424113509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 1245424113509 in words is "one trillion, two hundred forty-five billion, four hundred twenty-four million, one hundred thirteen thousand, five hundred nine".