204121289 has 2 divisors, whose sum is σ = 204121290. Its totient is φ = 204121288.

The previous prime is 204121277. The next prime is 204121327. The reversal of 204121289 is 982121402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110670400 + 93450889 = 10520^2 + 9667^2 .

It is a cyclic number.

It is not a de Polignac number, because 204121289 - 2⁴ = 204121273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (204121219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102060644 + 102060645.

It is an arithmetic number, because the mean of its divisors is an integer number (102060645).

Almost surely, 2^204121289 is an apocalyptic number.

It is an amenable number.

204121289 is a deficient number, since it is larger than the sum of its proper divisors (1).

204121289 is an equidigital number, since it uses as much as digits as its factorization.

204121289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 204121289 is about 14287.1021904374. The cubic root of 204121289 is about 588.7931752212.

The spelling of 204121289 in words is "two hundred four million, one hundred twenty-one thousand, two hundred eighty-nine".