16321289 has 2 divisors, whose sum is σ = 16321290. Its totient is φ = 16321288.

The previous prime is 16321271. The next prime is 16321301. The reversal of 16321289 is 98212361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 2778889 = 3680^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 16321289 - 2¹² = 16317193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16321219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8160644 + 8160645.

It is an arithmetic number, because the mean of its divisors is an integer number (8160645).

Almost surely, 2^16321289 is an apocalyptic number.

It is an amenable number.

16321289 is a deficient number, since it is larger than the sum of its proper divisors (1).

16321289 is an equidigital number, since it uses as much as digits as its factorization.

16321289 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 16321289 is about 4039.9615097176. The cubic root of 16321289 is about 253.6597061187.

The spelling of 16321289 in words is "sixteen million, three hundred twenty-one thousand, two hundred eighty-nine".