184866221 has 2 divisors, whose sum is σ = 184866222. Its totient is φ = 184866220.

The previous prime is 184866217. The next prime is 184866223. The reversal of 184866221 is 122668481.

It is a happy number.

184866221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181575625 + 3290596 = 13475^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 184866221 - 2² = 184866217 is a prime.

Together with 184866223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (184866223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92433110 + 92433111.

It is an arithmetic number, because the mean of its divisors is an integer number (92433111).

Almost surely, 2^184866221 is an apocalyptic number.

It is an amenable number.

184866221 is a deficient number, since it is larger than the sum of its proper divisors (1).

184866221 is an equidigital number, since it uses as much as digits as its factorization.

184866221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 38.

The square root of 184866221 is about 13596.5518055130. The cubic root of 184866221 is about 569.6645415075.

The spelling of 184866221 in words is "one hundred eighty-four million, eight hundred sixty-six thousand, two hundred twenty-one".