80581 has 4 divisors (see below), whose sum is σ = 81964. Its totient is φ = 79200.

The previous prime is 80567. The next prime is 80599. The reversal of 80581 is 18508.

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 36481 + 44100 = 191^2 + 210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80581 is a prime.

It is a super-2 number, since 2×80581² = 12986595122, which contains 22 as substring.

It is a Duffinian number.

80581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600 + ... + 721.

It is an arithmetic number, because the mean of its divisors is an integer number (20491).

It is a Poulet number, since it divides 2⁸⁰⁵⁸⁰-1.

2⁸⁰⁵⁸¹ is an apocalyptic number.

It is an amenable number.

80581 is a deficient number, since it is larger than the sum of its proper divisors (1383).

80581 is a wasteful number, since it uses less digits than its factorization.

80581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382.

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

The square root of 80581 is about 283.8679270365. The cubic root of 80581 is about 43.1927528424.

The spelling of 80581 in words is "eighty thousand, five hundred eighty-one".