79581 has 8 divisors (see below), whose sum is σ = 108864. Its totient is φ = 51680.

The previous prime is 79579. The next prime is 79589. The reversal of 79581 is 18597.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79581 - 2¹ = 79579 is a prime.

It is a super-2 number, since 2×79581² = 12666271122, which contains 22 as substring.

It is a plaindrome in base 8 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79589) 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 7 ways as a sum of consecutive naturals, for example, 201 + ... + 446.

It is an arithmetic number, because the mean of its divisors is an integer number (13608).

2⁷⁹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

79581 is a deficient number, since it is larger than the sum of its proper divisors (29283).

79581 is a wasteful number, since it uses less digits than its factorization.

79581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its digits is 2520, while the sum is 30.

The square root of 79581 is about 282.1010457265. The cubic root of 79581 is about 43.0133364077.

The spelling of 79581 in words is "seventy-nine thousand, five hundred eighty-one".