204067681 has 2 divisors, whose sum is σ = 204067682. Its totient is φ = 204067680.

The previous prime is 204067679. The next prime is 204067709. The reversal of 204067681 is 186760402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172528225 + 31539456 = 13135^2 + 5616^2 .

It is a cyclic number.

It is not a de Polignac number, because 204067681 - 2¹ = 204067679 is a prime.

It is a super-2 number, since 2×204067681² = 83287236857435522, which contains 22 as substring.

Together with 204067679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (204067601) 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, 102033840 + 102033841.

It is an arithmetic number, because the mean of its divisors is an integer number (102033841).

Almost surely, 2^204067681 is an apocalyptic number.

It is an amenable number.

204067681 is a deficient number, since it is larger than the sum of its proper divisors (1).

204067681 is an equidigital number, since it uses as much as digits as its factorization.

204067681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 204067681 is about 14285.2259695113. The cubic root of 204067681 is about 588.7416261508.

The spelling of 204067681 in words is "two hundred four million, sixty-seven thousand, six hundred eighty-one".