181530218 has 16 divisors (see below), whose sum is σ = 287053440. Its totient is φ = 85860000.

The previous prime is 181530143. The next prime is 181530241. The reversal of 181530218 is 812035181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25358 + ... + 31718.

It is an arithmetic number, because the mean of its divisors is an integer number (17940840).

Almost surely, 2^181530218 is an apocalyptic number.

181530218 is a deficient number, since it is larger than the sum of its proper divisors (105523222).

181530218 is a wasteful number, since it uses less digits than its factorization.

181530218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7133.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 181530218 is about 13473.3150337992. The cubic root of 181530218 is about 566.2170938617.

Adding to 181530218 its reverse (812035181), we get a palindrome (993565399).

The spelling of 181530218 in words is "one hundred eighty-one million, five hundred thirty thousand, two hundred eighteen".