218413397 has 2 divisors, whose sum is σ = 218413398. Its totient is φ = 218413396.

The previous prime is 218413373. The next prime is 218413453. The reversal of 218413397 is 793314812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213568996 + 4844401 = 14614^2 + 2201^2 .

It is a cyclic number.

It is not a de Polignac number, because 218413397 - 2⁶ = 218413333 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218413397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218413697) 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, 109206698 + 109206699.

It is an arithmetic number, because the mean of its divisors is an integer number (109206699).

Almost surely, 2^218413397 is an apocalyptic number.

It is an amenable number.

218413397 is a deficient number, since it is larger than the sum of its proper divisors (1).

218413397 is an equidigital number, since it uses as much as digits as its factorization.

218413397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 218413397 is about 14778.8158185966. The cubic root of 218413397 is about 602.2263555357.

The spelling of 218413397 in words is "two hundred eighteen million, four hundred thirteen thousand, three hundred ninety-seven".