204555251 has 2 divisors, whose sum is σ = 204555252. Its totient is φ = 204555250.

The previous prime is 204555229. The next prime is 204555259. The reversal of 204555251 is 152555402.

204555251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204555251 is a prime.

It is not a weakly prime, because it can be changed into another prime (204555259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102277625 + 102277626.

It is an arithmetic number, because the mean of its divisors is an integer number (102277626).

Almost surely, 2^204555251 is an apocalyptic number.

204555251 is a deficient number, since it is larger than the sum of its proper divisors (1).

204555251 is an equidigital number, since it uses as much as digits as its factorization.

204555251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 204555251 is about 14302.2813215235. The cubic root of 204555251 is about 589.2101381040.

The spelling of 204555251 in words is "two hundred four million, five hundred fifty-five thousand, two hundred fifty-one".