204115643 has 4 divisors (see below), whose sum is σ = 209632320. Its totient is φ = 198598968.

The previous prime is 204115627. The next prime is 204115649. The reversal of 204115643 is 346511402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346511402 = 2 ⋅173255701.

It is a cyclic number.

It is not a de Polignac number, because 204115643 - 2⁴ = 204115627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204115649) 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, 2758283 + ... + 2758356.

It is an arithmetic number, because the mean of its divisors is an integer number (52408080).

Almost surely, 2^204115643 is an apocalyptic number.

204115643 is a deficient number, since it is larger than the sum of its proper divisors (5516677).

204115643 is an equidigital number, since it uses as much as digits as its factorization.

204115643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5516676.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 204115643 is about 14286.9045982676. The cubic root of 204115643 is about 588.7877464932.

The spelling of 204115643 in words is "two hundred four million, one hundred fifteen thousand, six hundred forty-three".