231305205 has 16 divisors (see below), whose sum is σ = 370313280. Its totient is φ = 123287808.

The previous prime is 231305153. The next prime is 231305209. The reversal of 231305205 is 502503132.

It is not a de Polignac number, because 231305205 - 2⁶ = 231305141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231305209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28314 + ... + 35556.

It is an arithmetic number, because the mean of its divisors is an integer number (23144580).

Almost surely, 2^231305205 is an apocalyptic number.

It is an amenable number.

231305205 is a deficient number, since it is larger than the sum of its proper divisors (139008075).

231305205 is a wasteful number, since it uses less digits than its factorization.

231305205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9380.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 231305205 is about 15208.7213466484. The cubic root of 231305205 is about 613.8493522475.

Adding to 231305205 its reverse (502503132), we get a palindrome (733808337).

The spelling of 231305205 in words is "two hundred thirty-one million, three hundred five thousand, two hundred five".