204123659 has 2 divisors, whose sum is σ = 204123660. Its totient is φ = 204123658.

The previous prime is 204123583. The next prime is 204123757. The reversal of 204123659 is 956321402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204123659 - 2²⁰ = 203075083 is a prime.

It is not a weakly prime, because it can be changed into another prime (204125659) 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 as a sum of consecutive naturals, namely, 102061829 + 102061830.

It is an arithmetic number, because the mean of its divisors is an integer number (102061830).

Almost surely, 2^204123659 is an apocalyptic number.

204123659 is a deficient number, since it is larger than the sum of its proper divisors (1).

204123659 is an equidigital number, since it uses as much as digits as its factorization.

204123659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 204123659 is about 14287.1851321385. The cubic root of 204123659 is about 588.7954539880.

The spelling of 204123659 in words is "two hundred four million, one hundred twenty-three thousand, six hundred fifty-nine".