819442209193 has 2 divisors, whose sum is σ = 819442209194. Its totient is φ = 819442209192.

The previous prime is 819442209143. The next prime is 819442209293. The reversal of 819442209193 is 391902244918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 701166745449 + 118275463744 = 837357^2 + 343912^2 .

It is a cyclic number.

It is not a de Polignac number, because 819442209193 - 2²⁹ = 818905338281 is a prime.

It is a super-2 number, since 2×819442209193² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 819442209193.

It is not a weakly prime, because it can be changed into another prime (819442209143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409721104596 + 409721104597.

It is an arithmetic number, because the mean of its divisors is an integer number (409721104597).

Almost surely, 2^819442209193 is an apocalyptic number.

It is an amenable number.

819442209193 is a deficient number, since it is larger than the sum of its proper divisors (1).

819442209193 is an equidigital number, since it uses as much as digits as its factorization.

819442209193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 819442209193 in words is "eight hundred nineteen billion, four hundred forty-two million, two hundred nine thousand, one hundred ninety-three".