204843069089261 has 2 divisors, whose sum is σ = 204843069089262. Its totient is φ = 204843069089260.

The previous prime is 204843069089237. The next prime is 204843069089303. The reversal of 204843069089261 is 162980960348402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174726362928100 + 30116706161161 = 13218410^2 + 5487869^2 .

It is a cyclic number.

It is not a de Polignac number, because 204843069089261 - 2¹⁴ = 204843069072877 is a prime.

It is a super-2 number, since 2×204843069089261² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 204843069089194 and 204843069089203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204843069086261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102421534544630 + 102421534544631.

It is an arithmetic number, because the mean of its divisors is an integer number (102421534544631).

Almost surely, 2^{204843069089261} is an apocalyptic number.

It is an amenable number.

204843069089261 is a deficient number, since it is larger than the sum of its proper divisors (1).

204843069089261 is an equidigital number, since it uses as much as digits as its factorization.

204843069089261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35831808, while the sum is 62.

The spelling of 204843069089261 in words is "two hundred four trillion, eight hundred forty-three billion, sixty-nine million, eighty-nine thousand, two hundred sixty-one".