819142661317 has 2 divisors, whose sum is σ = 819142661318. Its totient is φ = 819142661316.

The previous prime is 819142661299. The next prime is 819142661333. The reversal of 819142661317 is 713166241918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520661821761 + 298480839556 = 721569^2 + 546334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819142661317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819142631317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409571330658 + 409571330659.

It is an arithmetic number, because the mean of its divisors is an integer number (409571330659).

Almost surely, 2^819142661317 is an apocalyptic number.

It is an amenable number.

819142661317 is a deficient number, since it is larger than the sum of its proper divisors (1).

819142661317 is an equidigital number, since it uses as much as digits as its factorization.

819142661317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The spelling of 819142661317 in words is "eight hundred nineteen billion, one hundred forty-two million, six hundred sixty-one thousand, three hundred seventeen".