204120949 has 2 divisors, whose sum is σ = 204120950. Its totient is φ = 204120948.

The previous prime is 204120941. The next prime is 204120979. The reversal of 204120949 is 949021402.

It is a happy number.

204120949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154206724 + 49914225 = 12418^2 + 7065^2 .

It is a cyclic number.

It is not a de Polignac number, because 204120949 - 2³ = 204120941 is a prime.

It is a Chen prime.

It is equal to p_11294482 and since 204120949 and 11294482 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204120949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204120941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102060474 + 102060475.

It is an arithmetic number, because the mean of its divisors is an integer number (102060475).

Almost surely, 2^204120949 is an apocalyptic number.

It is an amenable number.

204120949 is a deficient number, since it is larger than the sum of its proper divisors (1).

204120949 is an equidigital number, since it uses as much as digits as its factorization.

204120949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 204120949 is about 14287.0902915884. The cubic root of 204120949 is about 588.7928483081.

The spelling of 204120949 in words is "two hundred four million, one hundred twenty thousand, nine hundred forty-nine".