1242401043817 has 2 divisors, whose sum is σ = 1242401043818. Its totient is φ = 1242401043816.

The previous prime is 1242401043809. The next prime is 1242401043827. The reversal of 1242401043817 is 7183401042421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694062274816 + 548338769001 = 833104^2 + 740499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242401043817 - 2³ = 1242401043809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242401043827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621200521908 + 621200521909.

It is an arithmetic number, because the mean of its divisors is an integer number (621200521909).

Almost surely, 2^{1242401043817} is an apocalyptic number.

It is an amenable number.

1242401043817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242401043817 is an equidigital number, since it uses as much as digits as its factorization.

1242401043817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 37.

The spelling of 1242401043817 in words is "one trillion, two hundred forty-two billion, four hundred one million, forty-three thousand, eight hundred seventeen".