990999999071 has 2 divisors, whose sum is σ = 990999999072. Its totient is φ = 990999999070.

The previous prime is 990999999029. The next prime is 990999999097. The reversal of 990999999071 is 170999999099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990999999071 - 2²² = 990995804767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990999929071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495499999535 + 495499999536.

It is an arithmetic number, because the mean of its divisors is an integer number (495499999536).

Almost surely, 2^990999999071 is an apocalyptic number.

990999999071 is a deficient number, since it is larger than the sum of its proper divisors (1).

990999999071 is an equidigital number, since it uses as much as digits as its factorization.

990999999071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 301327047, while the sum is 80.

The spelling of 990999999071 in words is "nine hundred ninety billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, seventy-one".