216688873 has 2 divisors, whose sum is σ = 216688874. Its totient is φ = 216688872.

The previous prime is 216688799. The next prime is 216688891. The reversal of 216688873 is 378886612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216325264 + 363609 = 14708^2 + 603^2 .

It is a cyclic number.

It is not a de Polignac number, because 216688873 - 2⁹ = 216688361 is a prime.

It is not a weakly prime, because it can be changed into another prime (216688973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108344436 + 108344437.

It is an arithmetic number, because the mean of its divisors is an integer number (108344437).

Almost surely, 2^216688873 is an apocalyptic number.

It is an amenable number.

216688873 is a deficient number, since it is larger than the sum of its proper divisors (1).

216688873 is an equidigital number, since it uses as much as digits as its factorization.

216688873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 49.

The square root of 216688873 is about 14720.3557361906. The cubic root of 216688873 is about 600.6371684914.

The spelling of 216688873 in words is "two hundred sixteen million, six hundred eighty-eight thousand, eight hundred seventy-three".