205140231 has 12 divisors (see below), whose sum is σ = 298447240. Its totient is φ = 135775440.

The previous prime is 205140223. The next prime is 205140251. The reversal of 205140231 is 132041502.

It is not a de Polignac number, because 205140231 - 2³ = 205140223 is a prime.

It is a super-2 number, since 2×205140231² = 84165028749466722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205140211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80740 + ... + 83241.

Almost surely, 2^205140231 is an apocalyptic number.

205140231 is a deficient number, since it is larger than the sum of its proper divisors (93307009).

205140231 is a wasteful number, since it uses less digits than its factorization.

205140231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164126 (or 164123 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 205140231 is about 14322.7173050368. The cubic root of 205140231 is about 589.7712711013.

Adding to 205140231 its reverse (132041502), we get a palindrome (337181733).

The spelling of 205140231 in words is "two hundred five million, one hundred forty thousand, two hundred thirty-one".