108561 has 4 divisors (see below), whose sum is σ = 144752. Its totient is φ = 72372.

The previous prime is 108557. The next prime is 108571. The reversal of 108561 is 165801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 108561 - 2² = 108557 is a prime.

It is a super-3 number, since 3×108561³ = 3838333974487443, which contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108541) 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, 18091 + ... + 18096.

It is an arithmetic number, because the mean of its divisors is an integer number (36188).

2¹⁰⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

108561 is a deficient number, since it is larger than the sum of its proper divisors (36191).

108561 is an equidigital number, since it uses as much as digits as its factorization.

108561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36190.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 108561 is about 329.4859632822. The cubic root of 108561 is about 47.7043458632.

Adding to 108561 its product of nonzero digits (240), we get a palindrome (108801).

The spelling of 108561 in words is "one hundred eight thousand, five hundred sixty-one".