218164423 has 2 divisors, whose sum is σ = 218164424. Its totient is φ = 218164422.

The previous prime is 218164411. The next prime is 218164439. The reversal of 218164423 is 324461812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218164423 - 2¹³ = 218156231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218164493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109082211 + 109082212.

It is an arithmetic number, because the mean of its divisors is an integer number (109082212).

Almost surely, 2^218164423 is an apocalyptic number.

218164423 is a deficient number, since it is larger than the sum of its proper divisors (1).

218164423 is an equidigital number, since it uses as much as digits as its factorization.

218164423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 218164423 is about 14770.3900760948. The cubic root of 218164423 is about 601.9974383912.

The spelling of 218164423 in words is "two hundred eighteen million, one hundred sixty-four thousand, four hundred twenty-three".