218898997 has 2 divisors, whose sum is σ = 218898998. Its totient is φ = 218898996.

The previous prime is 218898941. The next prime is 218899003. The reversal of 218898997 is 799898812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218773681 + 125316 = 14791^2 + 354^2 .

It is a cyclic number.

It is not a de Polignac number, because 218898997 - 2²³ = 210510389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218898907) 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, 109449498 + 109449499.

It is an arithmetic number, because the mean of its divisors is an integer number (109449499).

Almost surely, 2^218898997 is an apocalyptic number.

It is an amenable number.

218898997 is a deficient number, since it is larger than the sum of its proper divisors (1).

218898997 is an equidigital number, since it uses as much as digits as its factorization.

218898997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 61.

The square root of 218898997 is about 14795.2356182658. The cubic root of 218898997 is about 602.6723365069.

The spelling of 218898997 in words is "two hundred eighteen million, eight hundred ninety-eight thousand, nine hundred ninety-seven".