803581 has 4 divisors (see below), whose sum is σ = 812700. Its totient is φ = 794464.

The previous prime is 803549. The next prime is 803587. The reversal of 803581 is 185308.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 562500 + 241081 = 750^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 803581 - 2⁵ = 803549 is a prime.

It is a super-2 number, since 2×803581² = 1291484847122, which contains 22 as substring.

It is a Duffinian number.

803581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (803587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4426 + ... + 4603.

It is an arithmetic number, because the mean of its divisors is an integer number (203175).

2⁸⁰³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

803581 is a deficient number, since it is larger than the sum of its proper divisors (9119).

803581 is an equidigital number, since it uses as much as digits as its factorization.

803581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9118.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 803581 is about 896.4267956727. The cubic root of 803581 is about 92.9700832589.

Adding to 803581 its reverse (185308), we get a palindrome (988889).

The spelling of 803581 in words is "eight hundred three thousand, five hundred eighty-one".