216616297 has 2 divisors, whose sum is σ = 216616298. Its totient is φ = 216616296.

The previous prime is 216616289. The next prime is 216616303. The reversal of 216616297 is 792616612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142587481 + 74028816 = 11941^2 + 8604^2 .

It is a cyclic number.

It is not a de Polignac number, because 216616297 - 2³ = 216616289 is a prime.

It is not a weakly prime, because it can be changed into another prime (216616217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108308148 + 108308149.

It is an arithmetic number, because the mean of its divisors is an integer number (108308149).

Almost surely, 2^216616297 is an apocalyptic number.

It is an amenable number.

216616297 is a deficient number, since it is larger than the sum of its proper divisors (1).

216616297 is an equidigital number, since it uses as much as digits as its factorization.

216616297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 216616297 is about 14717.8903719249. The cubic root of 216616297 is about 600.5701035021.

The spelling of 216616297 in words is "two hundred sixteen million, six hundred sixteen thousand, two hundred ninety-seven".