817081 has 2 divisors, whose sum is σ = 817082. Its totient is φ = 817080.

The previous prime is 817073. The next prime is 817087. The reversal of 817081 is 180718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 783225 + 33856 = 885^2 + 184^2 .

It is a cyclic number.

It is not a de Polignac number, because 817081 - 2³ = 817073 is a prime.

It is a super-2 number, since 2×817081² = 1335242721122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (817087) 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, 408540 + 408541.

It is an arithmetic number, because the mean of its divisors is an integer number (408541).

2⁸¹⁷⁰⁸¹ is an apocalyptic number.

It is an amenable number.

817081 is a deficient number, since it is larger than the sum of its proper divisors (1).

817081 is an equidigital number, since it uses as much as digits as its factorization.

817081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 817081 is about 903.9253287745. The cubic root of 817081 is about 93.4878209613.

Adding to 817081 its reverse (180718), we get a palindrome (997799).

The spelling of 817081 in words is "eight hundred seventeen thousand, eighty-one".