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108865 = 521773
BaseRepresentation
bin11010100101000001
312112100001
4122211001
511440430
62200001
7632251
oct324501
9175301
10108865
1174879
1253001
133a723
142b961
15223ca
hex1a941

108865 has 4 divisors (see below), whose sum is σ = 130644. Its totient is φ = 87088.

The previous prime is 108863. The next prime is 108869. The reversal of 108865 is 568801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568801 = 3715373.

It can be written as a sum of positive squares in 2 ways, for example, as 25921 + 82944 = 161^2 + 288^2 .

It is a cyclic number.

It is not a de Polignac number, because 108865 - 21 = 108863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10882 + ... + 10891.

It is an arithmetic number, because the mean of its divisors is an integer number (32661).

2108865 is an apocalyptic number.

It is an amenable number.

108865 is a deficient number, since it is larger than the sum of its proper divisors (21779).

108865 is an equidigital number, since it uses as much as digits as its factorization.

108865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21778.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 108865 is about 329.9469654354. The cubic root of 108865 is about 47.7488326972.

The spelling of 108865 in words is "one hundred eight thousand, eight hundred sixty-five".

Divisors: 1 5 21773 108865