218537089 has 3 divisors (see below), whose sum is σ = 218551873. Its totient is φ = 218522306.

The previous prime is 218537041. The next prime is 218537153. The reversal of 218537089 is 980735812.

The square root of 218537089 is 14783.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 218537089 - 2¹¹ = 218535041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218537009) 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 in 2 ways as a sum of consecutive naturals, for example, 7392 + ... + 22174.

Almost surely, 2^218537089 is an apocalyptic number.

218537089 is the 14783-rd square number.

218537089 is the 7392-nd centered octagonal number.

It is an amenable number.

218537089 is a deficient number, since it is larger than the sum of its proper divisors (14784).

218537089 is an frugal number, since it uses more digits than its factorization.

218537089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29566 (or 14783 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The cubic root of 218537089 is about 602.3400184733.

The spelling of 218537089 in words is "two hundred eighteen million, five hundred thirty-seven thousand, eighty-nine".