205530231 has 8 divisors (see below), whose sum is σ = 285955200. Its totient is φ = 131062712.

The previous prime is 205530229. The next prime is 205530307. The reversal of 205530231 is 132035502.

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

It is a cyclic number.

It is not a de Polignac number, because 205530231 - 2¹ = 205530229 is a prime.

It is a super-2 number, since 2×205530231² = 84485351709826722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205530198 and 205530207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205530331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1489281 + ... + 1489418.

It is an arithmetic number, because the mean of its divisors is an integer number (35744400).

Almost surely, 2^205530231 is an apocalyptic number.

205530231 is a deficient number, since it is larger than the sum of its proper divisors (80424969).

205530231 is a wasteful number, since it uses less digits than its factorization.

205530231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978725.

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

The square root of 205530231 is about 14336.3255752651. The cubic root of 205530231 is about 590.1447801355.

Adding to 205530231 its reverse (132035502), we get a palindrome (337565733).

It can be divided in two parts, 205530 and 231, that added together give a triangular number (205761 = T₆₄₁).

The spelling of 205530231 in words is "two hundred five million, five hundred thirty thousand, two hundred thirty-one".