231228218 has 8 divisors (see below), whose sum is σ = 373522548. Its totient is φ = 106720704.

The previous prime is 231228211. The next prime is 231228227. The reversal of 231228218 is 812822132.

It can be written as a sum of positive squares in 2 ways, for example, as 226592809 + 4635409 = 15053^2 + 2153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (231228211) 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 3 ways as a sum of consecutive naturals, for example, 4446671 + ... + 4446722.

Almost surely, 2^231228218 is an apocalyptic number.

231228218 is a deficient number, since it is larger than the sum of its proper divisors (142294330).

231228218 is a wasteful number, since it uses less digits than its factorization.

231228218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8893408.

The product of its digits is 3072, while the sum is 29.

The square root of 231228218 is about 15206.1901211316. The cubic root of 231228218 is about 613.7812407032.

The spelling of 231228218 in words is "two hundred thirty-one million, two hundred twenty-eight thousand, two hundred eighteen".