217348889 has 2 divisors, whose sum is σ = 217348890. Its totient is φ = 217348888.

The previous prime is 217348883. The next prime is 217348903. The reversal of 217348889 is 988843712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176491225 + 40857664 = 13285^2 + 6392^2 .

It is a cyclic number.

It is not a de Polignac number, because 217348889 - 2²⁴ = 200571673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (217348883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108674444 + 108674445.

It is an arithmetic number, because the mean of its divisors is an integer number (108674445).

Almost surely, 2^217348889 is an apocalyptic number.

It is an amenable number.

217348889 is a deficient number, since it is larger than the sum of its proper divisors (1).

217348889 is an equidigital number, since it uses as much as digits as its factorization.

217348889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 50.

The square root of 217348889 is about 14742.7571708958. The cubic root of 217348889 is about 601.2463803967.

The spelling of 217348889 in words is "two hundred seventeen million, three hundred forty-eight thousand, eight hundred eighty-nine".