205631255 has 16 divisors (see below), whose sum is σ = 254469600. Its totient is φ = 159439488.

The previous prime is 205631249. The next prime is 205631287. The reversal of 205631255 is 552136502.

It is a happy number.

205631255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 205631255 - 2⁶ = 205631191 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17321 + ... + 26669.

It is an arithmetic number, because the mean of its divisors is an integer number (15904350).

Almost surely, 2^205631255 is an apocalyptic number.

205631255 is a deficient number, since it is larger than the sum of its proper divisors (48838345).

205631255 is an equidigital number, since it uses as much as digits as its factorization.

205631255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9490.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 205631255 is about 14339.8484998971. The cubic root of 205631255 is about 590.2414553229.

Adding to 205631255 its reverse (552136502), we get a palindrome (757767757).

The spelling of 205631255 in words is "two hundred five million, six hundred thirty-one thousand, two hundred fifty-five".