999897329 has 2 divisors, whose sum is σ = 999897330. Its totient is φ = 999897328.

The previous prime is 999897277. The next prime is 999897373. The reversal of 999897329 is 923798999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 733326400 + 266570929 = 27080^2 + 16327^2 .

It is an emirp because it is prime and its reverse (923798999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999897329 - 2¹⁶ = 999831793 is a prime.

It is not a weakly prime, because it can be changed into another prime (999897029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499948664 + 499948665.

It is an arithmetic number, because the mean of its divisors is an integer number (499948665).

Almost surely, 2^999897329 is an apocalyptic number.

It is an amenable number.

999897329 is a deficient number, since it is larger than the sum of its proper divisors (1).

999897329 is an equidigital number, since it uses as much as digits as its factorization.

999897329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19840464, while the sum is 65.

The square root of 999897329 is about 31621.1531889651. The cubic root of 999897329 is about 999.9657751620.

The spelling of 999897329 in words is "nine hundred ninety-nine million, eight hundred ninety-seven thousand, three hundred twenty-nine".