218034389 has 2 divisors, whose sum is σ = 218034390. Its totient is φ = 218034388.

The previous prime is 218034379. The next prime is 218034403. The reversal of 218034389 is 983430812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121660900 + 96373489 = 11030^2 + 9817^2 .

It is a cyclic number.

It is not a de Polignac number, because 218034389 - 2⁴ = 218034373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218034359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109017194 + 109017195.

It is an arithmetic number, because the mean of its divisors is an integer number (109017195).

Almost surely, 2^218034389 is an apocalyptic number.

It is an amenable number.

218034389 is a deficient number, since it is larger than the sum of its proper divisors (1).

218034389 is an equidigital number, since it uses as much as digits as its factorization.

218034389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 218034389 is about 14765.9875727972. The cubic root of 218034389 is about 601.8778104341.

The spelling of 218034389 in words is "two hundred eighteen million, thirty-four thousand, three hundred eighty-nine".