204817121 has 2 divisors, whose sum is σ = 204817122. Its totient is φ = 204817120.

The previous prime is 204817079. The next prime is 204817159. The reversal of 204817121 is 121718402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111598096 + 93219025 = 10564^2 + 9655^2 .

It is a cyclic number.

It is not a de Polignac number, because 204817121 - 2¹⁴ = 204800737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204817021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102408560 + 102408561.

It is an arithmetic number, because the mean of its divisors is an integer number (102408561).

Almost surely, 2^204817121 is an apocalyptic number.

It is an amenable number.

204817121 is a deficient number, since it is larger than the sum of its proper divisors (1).

204817121 is an equidigital number, since it uses as much as digits as its factorization.

204817121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 204817121 is about 14311.4332266199. The cubic root of 204817121 is about 589.4614649246.

The spelling of 204817121 in words is "two hundred four million, eight hundred seventeen thousand, one hundred twenty-one".