204420649 has 2 divisors, whose sum is σ = 204420650. Its totient is φ = 204420648.

The previous prime is 204420589. The next prime is 204420661. The reversal of 204420649 is 946024402.

204420649 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 can be written as a sum of positive squares in only one way, i.e., 200420649 + 4000000 = 14157^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 204420649 - 2⁷ = 204420521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204420649.

It is not a weakly prime, because it can be changed into another prime (204420679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102210324 + 102210325.

It is an arithmetic number, because the mean of its divisors is an integer number (102210325).

Almost surely, 2^204420649 is an apocalyptic number.

It is an amenable number.

204420649 is a deficient number, since it is larger than the sum of its proper divisors (1).

204420649 is an equidigital number, since it uses as much as digits as its factorization.

204420649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 204420649 is about 14297.5749342327. The cubic root of 204420649 is about 589.0808718631.

The spelling of 204420649 in words is "two hundred four million, four hundred twenty thousand, six hundred forty-nine".