320667289 has 2 divisors, whose sum is σ = 320667290. Its totient is φ = 320667288.

The previous prime is 320667283. The next prime is 320667307. The reversal of 320667289 is 982766023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296115264 + 24552025 = 17208^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 320667289 - 2⁵ = 320667257 is a prime.

It is not a weakly prime, because it can be changed into another prime (320667283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160333644 + 160333645.

It is an arithmetic number, because the mean of its divisors is an integer number (160333645).

Almost surely, 2^320667289 is an apocalyptic number.

It is an amenable number.

320667289 is a deficient number, since it is larger than the sum of its proper divisors (1).

320667289 is an equidigital number, since it uses as much as digits as its factorization.

320667289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 320667289 is about 17907.1854013968. The cubic root of 320667289 is about 684.4654853052.

The spelling of 320667289 in words is "three hundred twenty million, six hundred sixty-seven thousand, two hundred eighty-nine".