204122431 has 4 divisors (see below), whose sum is σ = 204559992. Its totient is φ = 203684872.

The previous prime is 204122423. The next prime is 204122449. The reversal of 204122431 is 134221402.

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 204122431 - 2³ = 204122423 is a prime.

It is a super-2 number, since 2×204122431² = 83331933674699522, 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 = 204122399 and 204122408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204122411) 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, 218080 + ... + 219013.

It is an arithmetic number, because the mean of its divisors is an integer number (51139998).

Almost surely, 2^204122431 is an apocalyptic number.

204122431 is a deficient number, since it is larger than the sum of its proper divisors (437561).

204122431 is an equidigital number, since it uses as much as digits as its factorization.

204122431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437560.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 204122431 is about 14287.1421564986. The cubic root of 204122431 is about 588.7942732621.

Adding to 204122431 its reverse (134221402), we get a palindrome (338343833).

The spelling of 204122431 in words is "two hundred four million, one hundred twenty-two thousand, four hundred thirty-one".