216450889 has 2 divisors, whose sum is σ = 216450890. Its totient is φ = 216450888.

The previous prime is 216450877. The next prime is 216450929. The reversal of 216450889 is 988054612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140185600 + 76265289 = 11840^2 + 8733^2 .

It is a cyclic number.

It is not a de Polignac number, because 216450889 - 2¹⁵ = 216418121 is a prime.

It is not a weakly prime, because it can be changed into another prime (216450859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108225444 + 108225445.

It is an arithmetic number, because the mean of its divisors is an integer number (108225445).

Almost surely, 2^216450889 is an apocalyptic number.

It is an amenable number.

216450889 is a deficient number, since it is larger than the sum of its proper divisors (1).

216450889 is an equidigital number, since it uses as much as digits as its factorization.

216450889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 216450889 is about 14712.2700151948. The cubic root of 216450889 is about 600.4171996550.

The spelling of 216450889 in words is "two hundred sixteen million, four hundred fifty thousand, eight hundred eighty-nine".