204115123 has 4 divisors (see below), whose sum is σ = 204158880. Its totient is φ = 204071368.

The previous prime is 204115117. The next prime is 204115139. The reversal of 204115123 is 321511402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321511402 = 2 ⋅160755701.

It is a cyclic number.

It is not a de Polignac number, because 204115123 - 2⁵ = 204115091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204115123.

It is not an unprimeable number, because it can be changed into a prime (204115103) 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, 13915 + ... + 24532.

It is an arithmetic number, because the mean of its divisors is an integer number (51039720).

Almost surely, 2^204115123 is an apocalyptic number.

204115123 is a deficient number, since it is larger than the sum of its proper divisors (43757).

204115123 is an equidigital number, since it uses as much as digits as its factorization.

204115123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43756.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 204115123 is about 14286.8863997723. The cubic root of 204115123 is about 588.7872464990.

Adding to 204115123 its reverse (321511402), we get a palindrome (525626525).

The spelling of 204115123 in words is "two hundred four million, one hundred fifteen thousand, one hundred twenty-three".