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109885 = 521977
BaseRepresentation
bin11010110100111101
312120201211
4122310331
512004020
62204421
7635236
oct326475
9176654
10109885
1175616
1253711
133b029
142c08d
152285a
hex1ad3d

109885 has 4 divisors (see below), whose sum is σ = 131868. Its totient is φ = 87904.

The previous prime is 109883. The next prime is 109891. The reversal of 109885 is 588901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588901 = 2112791.

It can be written as a sum of positive squares in 2 ways, for example, as 45369 + 64516 = 213^2 + 254^2 .

It is a cyclic number.

It is not a de Polignac number, because 109885 - 21 = 109883 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

109885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109883) 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, 10984 + ... + 10993.

It is an arithmetic number, because the mean of its divisors is an integer number (32967).

2109885 is an apocalyptic number.

It is an amenable number.

109885 is a deficient number, since it is larger than the sum of its proper divisors (21983).

109885 is an equidigital number, since it uses as much as digits as its factorization.

109885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21982.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 109885 is about 331.4890646763. The cubic root of 109885 is about 47.8974953762.

The spelling of 109885 in words is "one hundred nine thousand, eight hundred eighty-five".

Divisors: 1 5 21977 109885