216214249 has 2 divisors, whose sum is σ = 216214250. Its totient is φ = 216214248.

The previous prime is 216214223. The next prime is 216214307. The reversal of 216214249 is 942412612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117072400 + 99141849 = 10820^2 + 9957^2 .

It is a cyclic number.

It is not a de Polignac number, because 216214249 - 2²³ = 207825641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216214249.

It is not a weakly prime, because it can be changed into another prime (216214949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108107124 + 108107125.

It is an arithmetic number, because the mean of its divisors is an integer number (108107125).

Almost surely, 2^216214249 is an apocalyptic number.

It is an amenable number.

216214249 is a deficient number, since it is larger than the sum of its proper divisors (1).

216214249 is an equidigital number, since it uses as much as digits as its factorization.

216214249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 216214249 is about 14704.2255491406. The cubic root of 216214249 is about 600.1983131496.

The spelling of 216214249 in words is "two hundred sixteen million, two hundred fourteen thousand, two hundred forty-nine".