204312431 has 4 divisors (see below), whose sum is σ = 208659552. Its totient is φ = 199965312.

The previous prime is 204312391. The next prime is 204312463. The reversal of 204312431 is 134213402.

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 204312431 - 2¹⁰ = 204311407 is a prime.

It is a super-2 number, since 2×204312431² = 83487138922259522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204312131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2173490 + ... + 2173583.

It is an arithmetic number, because the mean of its divisors is an integer number (52164888).

Almost surely, 2^204312431 is an apocalyptic number.

204312431 is a deficient number, since it is larger than the sum of its proper divisors (4347121).

204312431 is an equidigital number, since it uses as much as digits as its factorization.

204312431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4347120.

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

The square root of 204312431 is about 14293.7899452874. The cubic root of 204312431 is about 588.9769025776.

Adding to 204312431 its reverse (134213402), we get a palindrome (338525833).

The spelling of 204312431 in words is "two hundred four million, three hundred twelve thousand, four hundred thirty-one".