205500231 has 6 divisors (see below), whose sum is σ = 296833680. Its totient is φ = 137000148.

The previous prime is 205500187. The next prime is 205500263. The reversal of 205500231 is 132005502.

It is a happy number.

It is not a de Polignac number, because 205500231 - 2⁷ = 205500103 is a prime.

It is a super-2 number, since 2×205500231² = 84460689882106722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205504231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11416671 + ... + 11416688.

It is an arithmetic number, because the mean of its divisors is an integer number (49472280).

Almost surely, 2^205500231 is an apocalyptic number.

205500231 is a deficient number, since it is larger than the sum of its proper divisors (91333449).

205500231 is a wasteful number, since it uses less digits than its factorization.

205500231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22833365 (or 22833362 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 205500231 is about 14335.2792438794. The cubic root of 205500231 is about 590.1160654548.

Adding to 205500231 its reverse (132005502), we get a palindrome (337505733).

The spelling of 205500231 in words is "two hundred five million, five hundred thousand, two hundred thirty-one".