204120997 has 2 divisors, whose sum is σ = 204120998. Its totient is φ = 204120996.

The previous prime is 204120979. The next prime is 204121003. The reversal of 204120997 is 799021402.

It is a happy number.

Together with previous prime (204120979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168766081 + 35354916 = 12991^2 + 5946^2 .

It is a cyclic number.

It is not a de Polignac number, because 204120997 - 2⁷ = 204120869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204120907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102060498 + 102060499.

It is an arithmetic number, because the mean of its divisors is an integer number (102060499).

Almost surely, 2^204120997 is an apocalyptic number.

It is an amenable number.

204120997 is a deficient number, since it is larger than the sum of its proper divisors (1).

204120997 is an equidigital number, since it uses as much as digits as its factorization.

204120997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 204120997 is about 14287.0919714265. The cubic root of 204120997 is about 588.7928944606.

The spelling of 204120997 in words is "two hundred four million, one hundred twenty thousand, nine hundred ninety-seven".