989321 has 2 divisors, whose sum is σ = 989322. Its totient is φ = 989320.

The previous prime is 989309. The next prime is 989323. The reversal of 989321 is 123989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 929296 + 60025 = 964^2 + 245^2 .

It is an emirp because it is prime and its reverse (123989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989321 - 2¹⁰ = 988297 is a prime.

Together with 989323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989323) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494660 + 494661.

It is an arithmetic number, because the mean of its divisors is an integer number (494661).

2⁹⁸⁹³²¹ is an apocalyptic number.

It is an amenable number.

989321 is a deficient number, since it is larger than the sum of its proper divisors (1).

989321 is an equidigital number, since it uses as much as digits as its factorization.

989321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 989321 is about 994.6461682428. The cubic root of 989321 is about 99.6427586392.

The spelling of 989321 in words is "nine hundred eighty-nine thousand, three hundred twenty-one".