9791899391 has 2 divisors, whose sum is σ = 9791899392. Its totient is φ = 9791899390.

The previous prime is 9791899367. The next prime is 9791899421. The reversal of 9791899391 is 1939981979.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9791899391 - 2¹⁰ = 9791898367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9791899321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4895949695 + 4895949696.

It is an arithmetic number, because the mean of its divisors is an integer number (4895949696).

Almost surely, 2^9791899391 is an apocalyptic number.

9791899391 is a deficient number, since it is larger than the sum of its proper divisors (1).

9791899391 is an equidigital number, since it uses as much as digits as its factorization.

9791899391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9920232, while the sum is 65.

The square root of 9791899391 is about 98954.0266537951. The cubic root of 9791899391 is about 2139.3851693281.

The spelling of 9791899391 in words is "nine billion, seven hundred ninety-one million, eight hundred ninety-nine thousand, three hundred ninety-one".