819374059491 has 16 divisors (see below), whose sum is σ = 1195824608160. Its totient is φ = 495964120320.

The previous prime is 819374059489. The next prime is 819374059501. The reversal of 819374059491 is 194950473918.

It is not a de Polignac number, because 819374059491 - 2¹ = 819374059489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (819374059991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172207386 + ... + 172212143.

It is an arithmetic number, because the mean of its divisors is an integer number (74739038010).

Almost surely, 2^819374059491 is an apocalyptic number.

819374059491 is a deficient number, since it is larger than the sum of its proper divisors (376450548669).

819374059491 is a wasteful number, since it uses less digits than its factorization.

819374059491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344419606.

The product of its (nonzero) digits is 9797760, while the sum is 60.

The spelling of 819374059491 in words is "eight hundred nineteen billion, three hundred seventy-four million, fifty-nine thousand, four hundred ninety-one".