216650249 has 2 divisors, whose sum is σ = 216650250. Its totient is φ = 216650248.

The previous prime is 216650237. The next prime is 216650299. The reversal of 216650249 is 942056612.

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., 136422400 + 80227849 = 11680^2 + 8957^2 .

It is a cyclic number.

It is not a de Polignac number, because 216650249 - 2⁴ = 216650233 is a prime.

It is not a weakly prime, because it can be changed into another prime (216650209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108325124 + 108325125.

It is an arithmetic number, because the mean of its divisors is an integer number (108325125).

Almost surely, 2^216650249 is an apocalyptic number.

It is an amenable number.

216650249 is a deficient number, since it is larger than the sum of its proper divisors (1).

216650249 is an equidigital number, since it uses as much as digits as its factorization.

216650249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 216650249 is about 14719.0437529073. The cubic root of 216650249 is about 600.6014792438.

The spelling of 216650249 in words is "two hundred sixteen million, six hundred fifty thousand, two hundred forty-nine".