819797611 has 4 divisors (see below), whose sum is σ = 827318800. Its totient is φ = 812276424.

The previous prime is 819797609. The next prime is 819797633. The reversal of 819797611 is 116797918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116797918 = 2 ⋅58398959.

It is a cyclic number.

It is not a de Polignac number, because 819797611 - 2¹ = 819797609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819797651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3760431 + ... + 3760648.

It is an arithmetic number, because the mean of its divisors is an integer number (206829700).

Almost surely, 2^819797611 is an apocalyptic number.

819797611 is a deficient number, since it is larger than the sum of its proper divisors (7521189).

819797611 is a wasteful number, since it uses less digits than its factorization.

819797611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7521188.

The product of its digits is 190512, while the sum is 49.

The square root of 819797611 is about 28632.1080432440. The cubic root of 819797611 is about 935.9131502409.

The spelling of 819797611 in words is "eight hundred nineteen million, seven hundred ninety-seven thousand, six hundred eleven".