204534721 has 2 divisors, whose sum is σ = 204534722. Its totient is φ = 204534720.

The previous prime is 204534697. The next prime is 204534739. The reversal of 204534721 is 127435402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178890625 + 25644096 = 13375^2 + 5064^2 .

It is a cyclic number.

It is not a de Polignac number, because 204534721 - 2⁵ = 204534689 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204534721.

It is not a weakly prime, because it can be changed into another prime (204534751) 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, 102267360 + 102267361.

It is an arithmetic number, because the mean of its divisors is an integer number (102267361).

Almost surely, 2^204534721 is an apocalyptic number.

It is an amenable number.

204534721 is a deficient number, since it is larger than the sum of its proper divisors (1).

204534721 is an equidigital number, since it uses as much as digits as its factorization.

204534721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 204534721 is about 14301.5635858461. The cubic root of 204534721 is about 589.1904255996.

The spelling of 204534721 in words is "two hundred four million, five hundred thirty-four thousand, seven hundred twenty-one".