1242715707509 has 2 divisors, whose sum is σ = 1242715707510. Its totient is φ = 1242715707508.

The previous prime is 1242715707437. The next prime is 1242715707521. The reversal of 1242715707509 is 9057075172421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1112820339409 + 129895368100 = 1054903^2 + 360410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242715707509 - 2³² = 1238420740213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242715701509) 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, 621357853754 + 621357853755.

It is an arithmetic number, because the mean of its divisors is an integer number (621357853755).

Almost surely, 2^{1242715707509} is an apocalyptic number.

It is an amenable number.

1242715707509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242715707509 is an equidigital number, since it uses as much as digits as its factorization.

1242715707509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1234800, while the sum is 50.

The spelling of 1242715707509 in words is "one trillion, two hundred forty-two billion, seven hundred fifteen million, seven hundred seven thousand, five hundred nine".