819374059549 has 2 divisors, whose sum is σ = 819374059550. Its totient is φ = 819374059548.

The previous prime is 819374059531. The next prime is 819374059579. The reversal of 819374059549 is 945950473918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629234457049 + 190139602500 = 793243^2 + 436050^2 .

It is a cyclic number.

It is not a de Polignac number, because 819374059549 - 2²¹ = 819371962397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819374059579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409687029774 + 409687029775.

It is an arithmetic number, because the mean of its divisors is an integer number (409687029775).

Almost surely, 2^819374059549 is an apocalyptic number.

It is an amenable number.

819374059549 is a deficient number, since it is larger than the sum of its proper divisors (1).

819374059549 is an equidigital number, since it uses as much as digits as its factorization.

819374059549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48988800, while the sum is 64.

The spelling of 819374059549 in words is "eight hundred nineteen billion, three hundred seventy-four million, fifty-nine thousand, five hundred forty-nine".