218419189 has 2 divisors, whose sum is σ = 218419190. Its totient is φ = 218419188.

The previous prime is 218419181. The next prime is 218419241. The reversal of 218419189 is 981914812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159820164 + 58599025 = 12642^2 + 7655^2 .

It is a cyclic number.

It is not a de Polignac number, because 218419189 - 2³ = 218419181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218419181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109209594 + 109209595.

It is an arithmetic number, because the mean of its divisors is an integer number (109209595).

Almost surely, 2^218419189 is an apocalyptic number.

It is an amenable number.

218419189 is a deficient number, since it is larger than the sum of its proper divisors (1).

218419189 is an equidigital number, since it uses as much as digits as its factorization.

218419189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 43.

The square root of 218419189 is about 14779.0117734577. The cubic root of 218419189 is about 602.2316788725.

The spelling of 218419189 in words is "two hundred eighteen million, four hundred nineteen thousand, one hundred eighty-nine".