231530205 has 16 divisors (see below), whose sum is σ = 371821824. Its totient is φ = 123024960.

The previous prime is 231530203. The next prime is 231530237. The reversal of 231530205 is 502035132.

It is not a de Polignac number, because 231530205 - 2¹ = 231530203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231530203) 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, 24414 + ... + 32543.

It is an arithmetic number, because the mean of its divisors is an integer number (23238864).

Almost surely, 2^231530205 is an apocalyptic number.

It is an amenable number.

231530205 is a deficient number, since it is larger than the sum of its proper divisors (140291619).

231530205 is a wasteful number, since it uses less digits than its factorization.

231530205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57236.

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

The square root of 231530205 is about 15216.1166202156. The cubic root of 231530205 is about 614.0483265057.

Adding to 231530205 its reverse (502035132), we get a palindrome (733565337).

The spelling of 231530205 in words is "two hundred thirty-one million, five hundred thirty thousand, two hundred five".