204853409 has 2 divisors, whose sum is σ = 204853410. Its totient is φ = 204853408.

The previous prime is 204853393. The next prime is 204853463. The reversal of 204853409 is 904358402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193293409 + 11560000 = 13903^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 204853409 - 2⁴ = 204853393 is a prime.

It is not a weakly prime, because it can be changed into another prime (204853469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102426704 + 102426705.

It is an arithmetic number, because the mean of its divisors is an integer number (102426705).

Almost surely, 2^204853409 is an apocalyptic number.

It is an amenable number.

204853409 is a deficient number, since it is larger than the sum of its proper divisors (1).

204853409 is an equidigital number, since it uses as much as digits as its factorization.

204853409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 204853409 is about 14312.7009680214. The cubic root of 204853409 is about 589.4962750264.

The spelling of 204853409 in words is "two hundred four million, eight hundred fifty-three thousand, four hundred nine".