999079321 has 2 divisors, whose sum is σ = 999079322. Its totient is φ = 999079320.

The previous prime is 999079259. The next prime is 999079327. The reversal of 999079321 is 123970999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 940096921 + 58982400 = 30661^2 + 7680^2 .

It is an emirp because it is prime and its reverse (123970999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999079321 - 2¹¹ = 999077273 is a prime.

It is not a weakly prime, because it can be changed into another prime (999079327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499539660 + 499539661.

It is an arithmetic number, because the mean of its divisors is an integer number (499539661).

Almost surely, 2^999079321 is an apocalyptic number.

It is an amenable number.

999079321 is a deficient number, since it is larger than the sum of its proper divisors (1).

999079321 is an equidigital number, since it uses as much as digits as its factorization.

999079321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 999079321 is about 31608.2160363409. The cubic root of 999079321 is about 999.6930127685.

The spelling of 999079321 in words is "nine hundred ninety-nine million, seventy-nine thousand, three hundred twenty-one".