993321209 has 2 divisors, whose sum is σ = 993321210. Its totient is φ = 993321208.

The previous prime is 993321179. The next prime is 993321221. The reversal of 993321209 is 902123399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988159225 + 5161984 = 31435^2 + 2272^2 .

It is an emirp because it is prime and its reverse (902123399) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-993321209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (993321239) 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, 496660604 + 496660605.

It is an arithmetic number, because the mean of its divisors is an integer number (496660605).

Almost surely, 2^993321209 is an apocalyptic number.

It is an amenable number.

993321209 is a deficient number, since it is larger than the sum of its proper divisors (1).

993321209 is an equidigital number, since it uses as much as digits as its factorization.

993321209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 993321209 is about 31516.9987308436. The cubic root of 993321209 is about 997.7687616113.

The spelling of 993321209 in words is "nine hundred ninety-three million, three hundred twenty-one thousand, two hundred nine".