205538231 has 2 divisors, whose sum is σ = 205538232. Its totient is φ = 205538230.

The previous prime is 205538213. The next prime is 205538239. The reversal of 205538231 is 132835502.

Together with previous prime (205538213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205538231 - 2¹⁰ = 205537207 is a prime.

It is a super-2 number, since 2×205538231² = 84491928805218722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 205538194 and 205538203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205538239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102769115 + 102769116.

It is an arithmetic number, because the mean of its divisors is an integer number (102769116).

Almost surely, 2^205538231 is an apocalyptic number.

205538231 is a deficient number, since it is larger than the sum of its proper divisors (1).

205538231 is an equidigital number, since it uses as much as digits as its factorization.

205538231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 205538231 is about 14336.6045840708. The cubic root of 205538231 is about 590.1524369118.

The spelling of 205538231 in words is "two hundred five million, five hundred thirty-eight thousand, two hundred thirty-one".