218422447 has 2 divisors, whose sum is σ = 218422448. Its totient is φ = 218422446.

The previous prime is 218422441. The next prime is 218422571. The reversal of 218422447 is 744224812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218422447 - 2²³ = 210033839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218422441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109211223 + 109211224.

It is an arithmetic number, because the mean of its divisors is an integer number (109211224).

Almost surely, 2^218422447 is an apocalyptic number.

218422447 is a deficient number, since it is larger than the sum of its proper divisors (1).

218422447 is an equidigital number, since it uses as much as digits as its factorization.

218422447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 34.

The square root of 218422447 is about 14779.1219969253. The cubic root of 218422447 is about 602.2346732081.

The spelling of 218422447 in words is "two hundred eighteen million, four hundred twenty-two thousand, four hundred forty-seven".