204651281 has 2 divisors, whose sum is σ = 204651282. Its totient is φ = 204651280.

The previous prime is 204651247. The next prime is 204651331. The reversal of 204651281 is 182156402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201895681 + 2755600 = 14209^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 204651281 - 2²⁶ = 137542417 is a prime.

It is a super-2 number, since 2×204651281² = 83764293629881922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204651211) 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, 102325640 + 102325641.

It is an arithmetic number, because the mean of its divisors is an integer number (102325641).

Almost surely, 2^204651281 is an apocalyptic number.

It is an amenable number.

204651281 is a deficient number, since it is larger than the sum of its proper divisors (1).

204651281 is an equidigital number, since it uses as much as digits as its factorization.

204651281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 204651281 is about 14305.6380843358. The cubic root of 204651281 is about 589.3023267218.

The spelling of 204651281 in words is "two hundred four million, six hundred fifty-one thousand, two hundred eighty-one".