204226681 has 2 divisors, whose sum is σ = 204226682. Its totient is φ = 204226680.

The previous prime is 204226621. The next prime is 204226691. The reversal of 204226681 is 186622402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155226681 + 49000000 = 12459^2 + 7000^2 .

It is a cyclic number.

It is not a de Polignac number, because 204226681 - 2¹¹ = 204224633 is a prime.

It is a super-2 number, since 2×204226681² = 83417074464551522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204226621) 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, 102113340 + 102113341.

It is an arithmetic number, because the mean of its divisors is an integer number (102113341).

Almost surely, 2^204226681 is an apocalyptic number.

It is an amenable number.

204226681 is a deficient number, since it is larger than the sum of its proper divisors (1).

204226681 is an equidigital number, since it uses as much as digits as its factorization.

204226681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 204226681 is about 14290.7900761295. The cubic root of 204226681 is about 588.8944931089.

The spelling of 204226681 in words is "two hundred four million, two hundred twenty-six thousand, six hundred eighty-one".