818189 has 2 divisors, whose sum is σ = 818190. Its totient is φ = 818188.

The previous prime is 818173. The next prime is 818219. The reversal of 818189 is 981818.

818189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 537289 + 280900 = 733^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 818189 - 2⁴ = 818173 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409094 + 409095.

It is an arithmetic number, because the mean of its divisors is an integer number (409095).

2⁸¹⁸¹⁸⁹ is an apocalyptic number.

It is an amenable number.

818189 is a deficient number, since it is larger than the sum of its proper divisors (1).

818189 is an equidigital number, since it uses as much as digits as its factorization.

818189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 35.

The square root of 818189 is about 904.5380036239. The cubic root of 818189 is about 93.5300598250.

The spelling of 818189 in words is "eight hundred eighteen thousand, one hundred eighty-nine".