999719321 has 2 divisors, whose sum is σ = 999719322. Its totient is φ = 999719320.

The previous prime is 999719293. The next prime is 999719351. The reversal of 999719321 is 123917999.

999719321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 794112400 + 205606921 = 28180^2 + 14339^2 .

It is a cyclic number.

It is not a de Polignac number, because 999719321 - 2¹⁰ = 999718297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 999719321.

It is not a weakly prime, because it can be changed into another prime (999719351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499859660 + 499859661.

It is an arithmetic number, because the mean of its divisors is an integer number (499859661).

Almost surely, 2^999719321 is an apocalyptic number.

It is an amenable number.

999719321 is a deficient number, since it is larger than the sum of its proper divisors (1).

999719321 is an equidigital number, since it uses as much as digits as its factorization.

999719321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 50.

The square root of 999719321 is about 31618.3383655751. The cubic root of 999719321 is about 999.9064315786.

The spelling of 999719321 in words is "nine hundred ninety-nine million, seven hundred nineteen thousand, three hundred twenty-one".