216245009 has 2 divisors, whose sum is σ = 216245010. Its totient is φ = 216245008.

The previous prime is 216244993. The next prime is 216245017. The reversal of 216245009 is 900542612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214915600 + 1329409 = 14660^2 + 1153^2 .

It is a cyclic number.

It is not a de Polignac number, because 216245009 - 2⁴ = 216244993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216245509) 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, 108122504 + 108122505.

It is an arithmetic number, because the mean of its divisors is an integer number (108122505).

Almost surely, 2^216245009 is an apocalyptic number.

It is an amenable number.

216245009 is a deficient number, since it is larger than the sum of its proper divisors (1).

216245009 is an equidigital number, since it uses as much as digits as its factorization.

216245009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 216245009 is about 14705.2714697825. The cubic root of 216245009 is about 600.2267744633.

The spelling of 216245009 in words is "two hundred sixteen million, two hundred forty-five thousand, nine".