991119310849 has 2 divisors, whose sum is σ = 991119310850. Its totient is φ = 991119310848.

The previous prime is 991119310789. The next prime is 991119310877. The reversal of 991119310849 is 948013911199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 745514818624 + 245604492225 = 863432^2 + 495585^2 .

It is a cyclic number.

It is not a de Polignac number, because 991119310849 - 2¹⁷ = 991119179777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 991119310849.

It is not a weakly prime, because it can be changed into another prime (991119317849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495559655424 + 495559655425.

It is an arithmetic number, because the mean of its divisors is an integer number (495559655425).

Almost surely, 2^991119310849 is an apocalyptic number.

It is an amenable number.

991119310849 is a deficient number, since it is larger than the sum of its proper divisors (1).

991119310849 is an equidigital number, since it uses as much as digits as its factorization.

991119310849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 55.

The spelling of 991119310849 in words is "nine hundred ninety-one billion, one hundred nineteen million, three hundred ten thousand, eight hundred forty-nine".