1242342132509 has 2 divisors, whose sum is σ = 1242342132510. Its totient is φ = 1242342132508.

The previous prime is 1242342132503. The next prime is 1242342132529. The reversal of 1242342132509 is 9052312432421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866487307609 + 375854824900 = 930853^2 + 613070^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242342132509 - 2²⁰ = 1242341083933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242342132503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621171066254 + 621171066255.

It is an arithmetic number, because the mean of its divisors is an integer number (621171066255).

Almost surely, 2^{1242342132509} is an apocalyptic number.

It is an amenable number.

1242342132509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242342132509 is an equidigital number, since it uses as much as digits as its factorization.

1242342132509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 1242342132509 in words is "one trillion, two hundred forty-two billion, three hundred forty-two million, one hundred thirty-two thousand, five hundred nine".