204547997 has 2 divisors, whose sum is σ = 204547998. Its totient is φ = 204547996.

The previous prime is 204547979. The next prime is 204548011. The reversal of 204547997 is 799745402.

204547997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (204547979) 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., 104427961 + 100120036 = 10219^2 + 10006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204547997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204547907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102273998 + 102273999.

It is an arithmetic number, because the mean of its divisors is an integer number (102273999).

Almost surely, 2^204547997 is an apocalyptic number.

It is an amenable number.

204547997 is a deficient number, since it is larger than the sum of its proper divisors (1).

204547997 is an equidigital number, since it uses as much as digits as its factorization.

204547997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 204547997 is about 14302.0277233685. The cubic root of 204547997 is about 589.2031731058.

The spelling of 204547997 in words is "two hundred four million, five hundred forty-seven thousand, nine hundred ninety-seven".