204663997 has 2 divisors, whose sum is σ = 204663998. Its totient is φ = 204663996.

The previous prime is 204663989. The next prime is 204664001. The reversal of 204663997 is 799366402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142348761 + 62315236 = 11931^2 + 7894^2 .

It is a cyclic number.

It is not a de Polignac number, because 204663997 - 2³ = 204663989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204663917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102331998 + 102331999.

It is an arithmetic number, because the mean of its divisors is an integer number (102331999).

Almost surely, 2^204663997 is an apocalyptic number.

It is an amenable number.

204663997 is a deficient number, since it is larger than the sum of its proper divisors (1).

204663997 is an equidigital number, since it uses as much as digits as its factorization.

204663997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 204663997 is about 14306.0825175867. The cubic root of 204663997 is about 589.3145318954.

The spelling of 204663997 in words is "two hundred four million, six hundred sixty-three thousand, nine hundred ninety-seven".