204431231 has 2 divisors, whose sum is σ = 204431232. Its totient is φ = 204431230.

The previous prime is 204431221. The next prime is 204431243. The reversal of 204431231 is 132134402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204431231 - 2⁶ = 204431167 is a prime.

It is a super-2 number, since 2×204431231² = 83584256416350722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204431221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102215615 + 102215616.

It is an arithmetic number, because the mean of its divisors is an integer number (102215616).

Almost surely, 2^204431231 is an apocalyptic number.

204431231 is a deficient number, since it is larger than the sum of its proper divisors (1).

204431231 is an equidigital number, since it uses as much as digits as its factorization.

204431231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 204431231 is about 14297.9449922008. The cubic root of 204431231 is about 589.0910364367.

Adding to 204431231 its reverse (132134402), we get a palindrome (336565633).

The spelling of 204431231 in words is "two hundred four million, four hundred thirty-one thousand, two hundred thirty-one".