803686561 has 2 divisors, whose sum is σ = 803686562. Its totient is φ = 803686560.

The previous prime is 803686531. The next prime is 803686573. The reversal of 803686561 is 165686308.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644144400 + 159542161 = 25380^2 + 12631^2 .

It is a cyclic number.

It is not a de Polignac number, because 803686561 - 2¹¹ = 803684513 is a prime.

It is not a weakly prime, because it can be changed into another prime (803686531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401843280 + 401843281.

It is an arithmetic number, because the mean of its divisors is an integer number (401843281).

Almost surely, 2^803686561 is an apocalyptic number.

It is an amenable number.

803686561 is a deficient number, since it is larger than the sum of its proper divisors (1).

803686561 is an equidigital number, since it uses as much as digits as its factorization.

803686561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 803686561 is about 28349.3661481170. The cubic root of 803686561 is about 929.7415403096.

The spelling of 803686561 in words is "eight hundred three million, six hundred eighty-six thousand, five hundred sixty-one".