218789897 has 2 divisors, whose sum is σ = 218789898. Its totient is φ = 218789896.

The previous prime is 218789887. The next prime is 218789933. The reversal of 218789897 is 798987812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157653136 + 61136761 = 12556^2 + 7819^2 .

It is a cyclic number.

It is not a de Polignac number, because 218789897 - 2¹⁶ = 218724361 is a prime.

It is not a weakly prime, because it can be changed into another prime (218789827) 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, 109394948 + 109394949.

It is an arithmetic number, because the mean of its divisors is an integer number (109394949).

Almost surely, 2^218789897 is an apocalyptic number.

It is an amenable number.

218789897 is a deficient number, since it is larger than the sum of its proper divisors (1).

218789897 is an equidigital number, since it uses as much as digits as its factorization.

218789897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 59.

The square root of 218789897 is about 14791.5481610276. The cubic root of 218789897 is about 602.5721952250.

The spelling of 218789897 in words is "two hundred eighteen million, seven hundred eighty-nine thousand, eight hundred ninety-seven".