204129923 has 2 divisors, whose sum is σ = 204129924. Its totient is φ = 204129922.

The previous prime is 204129847. The next prime is 204129929. The reversal of 204129923 is 329921402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204129923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204129923.

It is not a weakly prime, because it can be changed into another prime (204129929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102064961 + 102064962.

It is an arithmetic number, because the mean of its divisors is an integer number (102064962).

Almost surely, 2^204129923 is an apocalyptic number.

204129923 is a deficient number, since it is larger than the sum of its proper divisors (1).

204129923 is an equidigital number, since it uses as much as digits as its factorization.

204129923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 204129923 is about 14287.4043478863. The cubic root of 204129923 is about 588.8014767702.

The spelling of 204129923 in words is "two hundred four million, one hundred twenty-nine thousand, nine hundred twenty-three".