1217119420817 has 2 divisors, whose sum is σ = 1217119420818. Its totient is φ = 1217119420816.

The previous prime is 1217119420793. The next prime is 1217119420841. The reversal of 1217119420817 is 7180249117121.

It is a balanced prime because it is at equal distance from previous prime (1217119420793) and next prime (1217119420841).

It can be written as a sum of positive squares in only one way, i.e., 1217118639361 + 781456 = 1103231^2 + 884^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217119420817 - 2¹⁰ = 1217119419793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1217119420417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608559710408 + 608559710409.

It is an arithmetic number, because the mean of its divisors is an integer number (608559710409).

Almost surely, 2^{1217119420817} is an apocalyptic number.

It is an amenable number.

1217119420817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217119420817 is an equidigital number, since it uses as much as digits as its factorization.

1217119420817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 44.

The spelling of 1217119420817 in words is "one trillion, two hundred seventeen billion, one hundred nineteen million, four hundred twenty thousand, eight hundred seventeen".