218346473 has 2 divisors, whose sum is σ = 218346474. Its totient is φ = 218346472.

The previous prime is 218346463. The next prime is 218346517. The reversal of 218346473 is 374643812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216295849 + 2050624 = 14707^2 + 1432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218346473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (218346463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109173236 + 109173237.

It is an arithmetic number, because the mean of its divisors is an integer number (109173237).

Almost surely, 2^218346473 is an apocalyptic number.

It is an amenable number.

218346473 is a deficient number, since it is larger than the sum of its proper divisors (1).

218346473 is an equidigital number, since it uses as much as digits as its factorization.

218346473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 38.

The square root of 218346473 is about 14776.5514583072. The cubic root of 218346473 is about 602.1648399048.

The spelling of 218346473 in words is "two hundred eighteen million, three hundred forty-six thousand, four hundred seventy-three".