990999793291 has 2 divisors, whose sum is σ = 990999793292. Its totient is φ = 990999793290.

The previous prime is 990999793249. The next prime is 990999793337. The reversal of 990999793291 is 192397999099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990999793291 - 2¹⁵ = 990999760523 is a prime.

It is a super-2 number, since 2×990999793291² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990999793391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495499896645 + 495499896646.

It is an arithmetic number, because the mean of its divisors is an integer number (495499896646).

Almost surely, 2^990999793291 is an apocalyptic number.

990999793291 is a deficient number, since it is larger than the sum of its proper divisors (1).

990999793291 is an equidigital number, since it uses as much as digits as its factorization.

990999793291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200884698, while the sum is 76.

The spelling of 990999793291 in words is "nine hundred ninety billion, nine hundred ninety-nine million, seven hundred ninety-three thousand, two hundred ninety-one".