205243431 has 16 divisors (see below), whose sum is σ = 291612384. Its totient is φ = 127954944.

The previous prime is 205243393. The next prime is 205243481. The reversal of 205243431 is 134342502.

205243431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205243431 - 2¹⁰ = 205242407 is a prime.

It is a super-2 number, since 2×205243431² = 84249731937303522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205243481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4810 + ... + 20823.

It is an arithmetic number, because the mean of its divisors is an integer number (18225774).

Almost surely, 2^205243431 is an apocalyptic number.

205243431 is a deficient number, since it is larger than the sum of its proper divisors (86368953).

205243431 is a wasteful number, since it uses less digits than its factorization.

205243431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25810.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 205243431 is about 14326.3195203793. The cubic root of 205243431 is about 589.8701533656.

Adding to 205243431 its reverse (134342502), we get a palindrome (339585933).

The spelling of 205243431 in words is "two hundred five million, two hundred forty-three thousand, four hundred thirty-one".