218797 has 2 divisors, whose sum is σ = 218798. Its totient is φ = 218796.

The previous prime is 218783. The next prime is 218809. The reversal of 218797 is 797812.

218797 is nontrivially palindromic in base 13.

218797 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198916 + 19881 = 446^2 + 141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218797 is a prime.

218797 is an undulating number in base 13.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218717) 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, 109398 + 109399.

It is an arithmetic number, because the mean of its divisors is an integer number (109399).

2²¹⁸⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

218797 is a deficient number, since it is larger than the sum of its proper divisors (1).

218797 is an equidigital number, since it uses as much as digits as its factorization.

218797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 34.

The square root of 218797 is about 467.7574157616. The cubic root of 218797 is about 60.2578715977.

The spelling of 218797 in words is "two hundred eighteen thousand, seven hundred ninety-seven".