218423459 has 2 divisors, whose sum is σ = 218423460. Its totient is φ = 218423458.

The previous prime is 218423453. The next prime is 218423483. The reversal of 218423459 is 954324812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218423459 - 2²⁴ = 201646243 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218423453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109211729 + 109211730.

It is an arithmetic number, because the mean of its divisors is an integer number (109211730).

Almost surely, 2^218423459 is an apocalyptic number.

218423459 is a deficient number, since it is larger than the sum of its proper divisors (1).

218423459 is an equidigital number, since it uses as much as digits as its factorization.

218423459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 38.

The square root of 218423459 is about 14779.1562343728. The cubic root of 218423459 is about 602.2356033026.

The spelling of 218423459 in words is "two hundred eighteen million, four hundred twenty-three thousand, four hundred fifty-nine".