217616089 has 2 divisors, whose sum is σ = 217616090. Its totient is φ = 217616088.

The previous prime is 217616083. The next prime is 217616093. The reversal of 217616089 is 980616712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177102864 + 40513225 = 13308^2 + 6365^2 .

It is a cyclic number.

It is not a de Polignac number, because 217616089 - 2⁷ = 217615961 is a prime.

It is not a weakly prime, because it can be changed into another prime (217616083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108808044 + 108808045.

It is an arithmetic number, because the mean of its divisors is an integer number (108808045).

Almost surely, 2^217616089 is an apocalyptic number.

It is an amenable number.

217616089 is a deficient number, since it is larger than the sum of its proper divisors (1).

217616089 is an equidigital number, since it uses as much as digits as its factorization.

217616089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 217616089 is about 14751.8164644223. The cubic root of 217616089 is about 601.4926622235.

The spelling of 217616089 in words is "two hundred seventeen million, six hundred sixteen thousand, eighty-nine".