204769681 has 2 divisors, whose sum is σ = 204769682. Its totient is φ = 204769680.

The previous prime is 204769679. The next prime is 204769711. The reversal of 204769681 is 186967402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154132225 + 50637456 = 12415^2 + 7116^2 .

It is a cyclic number.

It is not a de Polignac number, because 204769681 - 2¹ = 204769679 is a prime.

It is a super-2 number, since 2×204769681² = 83861244513683522, which contains 22 as substring.

Together with 204769679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (204769181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102384840 + 102384841.

It is an arithmetic number, because the mean of its divisors is an integer number (102384841).

Almost surely, 2^204769681 is an apocalyptic number.

It is an amenable number.

204769681 is a deficient number, since it is larger than the sum of its proper divisors (1).

204769681 is an equidigital number, since it uses as much as digits as its factorization.

204769681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 204769681 is about 14309.7757145247. The cubic root of 204769681 is about 589.4159508076.

The spelling of 204769681 in words is "two hundred four million, seven hundred sixty-nine thousand, six hundred eighty-one".