166289 has 2 divisors, whose sum is σ = 166290. Its totient is φ = 166288.

The previous prime is 166273. The next prime is 166297. The reversal of 166289 is 982661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146689 + 19600 = 383^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 166289 - 2⁴ = 166273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166219) 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, 83144 + 83145.

It is an arithmetic number, because the mean of its divisors is an integer number (83145).

2¹⁶⁶²⁸⁹ is an apocalyptic number.

It is an amenable number.

166289 is a deficient number, since it is larger than the sum of its proper divisors (1).

166289 is an equidigital number, since it uses as much as digits as its factorization.

166289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 166289 is about 407.7854828215. The cubic root of 166289 is about 54.9905217827.

It can be divided in two parts, 166 and 289, that multiplied together give a palindrome (47974).

The spelling of 166289 in words is "one hundred sixty-six thousand, two hundred eighty-nine".