218501073 has 48 divisors (see below), whose sum is σ = 372303360. Its totient is φ = 120901248.

The previous prime is 218501071. The next prime is 218501089. The reversal of 218501073 is 370105812.

It is not a de Polignac number, because 218501073 - 2¹ = 218501071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218501071) 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 in 47 ways as a sum of consecutive naturals, for example, 322411 + ... + 323087.

It is an arithmetic number, because the mean of its divisors is an integer number (7756320).

Almost surely, 2^218501073 is an apocalyptic number.

It is an amenable number.

218501073 is a deficient number, since it is larger than the sum of its proper divisors (153802287).

218501073 is a wasteful number, since it uses less digits than its factorization.

218501073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 218501073 is about 14781.7817938163. The cubic root of 218501073 is about 602.3069271110.

Adding to 218501073 its reverse (370105812), we get a palindrome (588606885).

The spelling of 218501073 in words is "two hundred eighteen million, five hundred one thousand, seventy-three".