805081 has 2 divisors, whose sum is σ = 805082. Its totient is φ = 805080.

The previous prime is 805073. The next prime is 805097. The reversal of 805081 is 180508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632025 + 173056 = 795^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 805081 - 2³ = 805073 is a prime.

It is a super-2 number, since 2×805081² = 1296310833122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (805031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402540 + 402541.

It is an arithmetic number, because the mean of its divisors is an integer number (402541).

2⁸⁰⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

805081 is a deficient number, since it is larger than the sum of its proper divisors (1).

805081 is an equidigital number, since it uses as much as digits as its factorization.

805081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 805081 is about 897.2630606461. The cubic root of 805081 is about 93.0278946655.

Adding to 805081 its reverse (180508), we get a palindrome (985589).

The spelling of 805081 in words is "eight hundred five thousand, eighty-one".