218457229 has 2 divisors, whose sum is σ = 218457230. Its totient is φ = 218457228.

The previous prime is 218457221. The next prime is 218457263. The reversal of 218457229 is 922754812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164096100 + 54361129 = 12810^2 + 7373^2 .

It is a cyclic number.

It is not a de Polignac number, because 218457229 - 2³ = 218457221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218457191 and 218457200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218457221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109228614 + 109228615.

It is an arithmetic number, because the mean of its divisors is an integer number (109228615).

Almost surely, 2^218457229 is an apocalyptic number.

It is an amenable number.

218457229 is a deficient number, since it is larger than the sum of its proper divisors (1).

218457229 is an equidigital number, since it uses as much as digits as its factorization.

218457229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 218457229 is about 14780.2986776317. The cubic root of 218457229 is about 602.2666385043.

The spelling of 218457229 in words is "two hundred eighteen million, four hundred fifty-seven thousand, two hundred twenty-nine".