804204581 has 2 divisors, whose sum is σ = 804204582. Its totient is φ = 804204580.

The previous prime is 804204523. The next prime is 804204589. The reversal of 804204581 is 185402408.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 465092356 + 339112225 = 21566^2 + 18415^2 .

It is a cyclic number.

It is not a de Polignac number, because 804204581 - 2¹⁴ = 804188197 is a prime.

It is a super-2 number, since 2×804204581² = 1293490016202771122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804204589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402102290 + 402102291.

It is an arithmetic number, because the mean of its divisors is an integer number (402102291).

Almost surely, 2^804204581 is an apocalyptic number.

It is an amenable number.

804204581 is a deficient number, since it is larger than the sum of its proper divisors (1).

804204581 is an equidigital number, since it uses as much as digits as its factorization.

804204581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 804204581 is about 28358.5010358446. The cubic root of 804204581 is about 929.9412538527.

Adding to 804204581 its reverse (185402408), we get a palindrome (989606989).

The spelling of 804204581 in words is "eight hundred four million, two hundred four thousand, five hundred eighty-one".