205550431 has 4 divisors (see below), whose sum is σ = 205639072. Its totient is φ = 205461792.

The previous prime is 205550393. The next prime is 205550437. The reversal of 205550431 is 134055502.

205550431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 205550431 - 2²³ = 197161823 is a prime.

It is a super-2 number, since 2×205550431² = 84501959368571522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205550396 and 205550405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205550437) 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, 40746 + ... + 45511.

It is an arithmetic number, because the mean of its divisors is an integer number (51409768).

Almost surely, 2^205550431 is an apocalyptic number.

205550431 is a deficient number, since it is larger than the sum of its proper divisors (88641).

205550431 is an equidigital number, since it uses as much as digits as its factorization.

205550431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88640.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 205550431 is about 14337.0300620456. The cubic root of 205550431 is about 590.1641131131.

The spelling of 205550431 in words is "two hundred five million, five hundred fifty thousand, four hundred thirty-one".