218244413 has 2 divisors, whose sum is σ = 218244414. Its totient is φ = 218244412.

The previous prime is 218244409. The next prime is 218244437. The reversal of 218244413 is 314442812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157201444 + 61042969 = 12538^2 + 7813^2 .

It is a cyclic number.

It is not a de Polignac number, because 218244413 - 2² = 218244409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218244443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109122206 + 109122207.

It is an arithmetic number, because the mean of its divisors is an integer number (109122207).

Almost surely, 2^218244413 is an apocalyptic number.

It is an amenable number.

218244413 is a deficient number, since it is larger than the sum of its proper divisors (1).

218244413 is an equidigital number, since it uses as much as digits as its factorization.

218244413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 29.

The square root of 218244413 is about 14773.0976101832. The cubic root of 218244413 is about 602.0710035344.

The spelling of 218244413 in words is "two hundred eighteen million, two hundred forty-four thousand, four hundred thirteen".