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2189321 is a prime number
BaseRepresentation
bin1000010110100000001001
311010020011222
420112200021
51030024241
6114531425
724415601
oct10264011
94106158
102189321
111265962
12896b75
135b8674
1440dc01
152d3a4b
hex216809

2189321 has 2 divisors, whose sum is σ = 2189322. Its totient is φ = 2189320.

The previous prime is 2189309. The next prime is 2189323. The reversal of 2189321 is 1239812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1974025 + 215296 = 1405^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189321 - 210 = 2188297 is a prime.

Together with 2189323, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p161954 and since 2189321 and 161954 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (2189323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094660 + 1094661.

It is an arithmetic number, because the mean of its divisors is an integer number (1094661).

22189321 is an apocalyptic number.

It is an amenable number.

2189321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189321 is an equidigital number, since it uses as much as digits as its factorization.

2189321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 2189321 is about 1479.6354280700. The cubic root of 2189321 is about 129.8483636289.

The spelling of 2189321 in words is "two million, one hundred eighty-nine thousand, three hundred twenty-one".