204115313 has 4 divisors (see below), whose sum is σ = 208458240. Its totient is φ = 199772388.

The previous prime is 204115291. The next prime is 204115319. The reversal of 204115313 is 313511402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204115313 - 2⁸ = 204115057 is a prime.

It is a super-2 number, since 2×204115313² = 83326122002175938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204115319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2171393 + ... + 2171486.

It is an arithmetic number, because the mean of its divisors is an integer number (52114560).

Almost surely, 2^204115313 is an apocalyptic number.

It is an amenable number.

204115313 is a deficient number, since it is larger than the sum of its proper divisors (4342927).

204115313 is an equidigital number, since it uses as much as digits as its factorization.

204115313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4342926.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 204115313 is about 14286.8930492252. The cubic root of 204115313 is about 588.7874291893.

Adding to 204115313 its reverse (313511402), we get a palindrome (517626715).

The spelling of 204115313 in words is "two hundred four million, one hundred fifteen thousand, three hundred thirteen".