204818981 has 2 divisors, whose sum is σ = 204818982. Its totient is φ = 204818980.

The previous prime is 204818969. The next prime is 204819037. The reversal of 204818981 is 189818402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159794881 + 45024100 = 12641^2 + 6710^2 .

It is a cyclic number.

It is not a de Polignac number, because 204818981 - 2¹⁰ = 204817957 is a prime.

It is a super-2 number, since 2×204818981² = 83901629955756722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204818921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102409490 + 102409491.

It is an arithmetic number, because the mean of its divisors is an integer number (102409491).

Almost surely, 2^204818981 is an apocalyptic number.

It is an amenable number.

204818981 is a deficient number, since it is larger than the sum of its proper divisors (1).

204818981 is an equidigital number, since it uses as much as digits as its factorization.

204818981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 204818981 is about 14311.4982094818. The cubic root of 204818981 is about 589.4632492725.

The spelling of 204818981 in words is "two hundred four million, eight hundred eighteen thousand, nine hundred eighty-one".