205240442231 has 4 divisors (see below), whose sum is σ = 223898664264. Its totient is φ = 186582220200.

The previous prime is 205240442227. The next prime is 205240442249. The reversal of 205240442231 is 132244042502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205240442231 - 2² = 205240442227 is a prime.

It is a super-2 number, since 2×205240442231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205240442194 and 205240442203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205240442221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9329111000 + ... + 9329111021.

It is an arithmetic number, because the mean of its divisors is an integer number (55974666066).

Almost surely, 2^205240442231 is an apocalyptic number.

205240442231 is a deficient number, since it is larger than the sum of its proper divisors (18658222033).

205240442231 is a wasteful number, since it uses less digits than its factorization.

205240442231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18658222032.

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 205240442231 its reverse (132244042502), we get a palindrome (337484484733).

The spelling of 205240442231 in words is "two hundred five billion, two hundred forty million, four hundred forty-two thousand, two hundred thirty-one".