218745361 has 2 divisors, whose sum is σ = 218745362. Its totient is φ = 218745360.

The previous prime is 218745349. The next prime is 218745403. The reversal of 218745361 is 163547812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189585361 + 29160000 = 13769^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 218745361 - 2¹¹ = 218743313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218745361.

It is not a weakly prime, because it can be changed into another prime (218745301) 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, 109372680 + 109372681.

It is an arithmetic number, because the mean of its divisors is an integer number (109372681).

Almost surely, 2^218745361 is an apocalyptic number.

It is an amenable number.

218745361 is a deficient number, since it is larger than the sum of its proper divisors (1).

218745361 is an equidigital number, since it uses as much as digits as its factorization.

218745361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 218745361 is about 14790.0426300941. The cubic root of 218745361 is about 602.5313067185.

The spelling of 218745361 in words is "two hundred eighteen million, seven hundred forty-five thousand, three hundred sixty-one".