204431155 has 4 divisors (see below), whose sum is σ = 245317392. Its totient is φ = 163544920.

The previous prime is 204431147. The next prime is 204431167. The reversal of 204431155 is 551134402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 204431155 - 2³ = 204431147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 20443111 + ... + 20443120.

It is an arithmetic number, because the mean of its divisors is an integer number (61329348).

Almost surely, 2^204431155 is an apocalyptic number.

204431155 is a deficient number, since it is larger than the sum of its proper divisors (40886237).

204431155 is an equidigital number, since it uses as much as digits as its factorization.

204431155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40886236.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 204431155 is about 14297.9423344760. The cubic root of 204431155 is about 589.0909634359.

Adding to 204431155 its reverse (551134402), we get a palindrome (755565557).

The spelling of 204431155 in words is "two hundred four million, four hundred thirty-one thousand, one hundred fifty-five".