205653231 has 24 divisors (see below), whose sum is σ = 341471520. Its totient is φ = 116830656.

The previous prime is 205653229. The next prime is 205653241. The reversal of 205653231 is 132356502.

205653231 is a `hidden beast` number, since 2 + 0 + 5 + 653 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 205653231 - 2¹ = 205653229 is a prime.

It is a super-2 number, since 2×205653231² = 84586502841478722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205653195 and 205653204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205653241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1465 + ... + 20333.

It is an arithmetic number, because the mean of its divisors is an integer number (14227980).

Almost surely, 2^205653231 is an apocalyptic number.

205653231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

205653231 is a deficient number, since it is larger than the sum of its proper divisors (135818289).

205653231 is a wasteful number, since it uses less digits than its factorization.

205653231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19055 (or 19052 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 205653231 is about 14340.6147357775. The cubic root of 205653231 is about 590.2624811217.

The spelling of 205653231 in words is "two hundred five million, six hundred fifty-three thousand, two hundred thirty-one".