112561 has 4 divisors (see below), whose sum is σ = 116224.
Its totient is φ = 108900.
The previous prime is 112559. The next prime is 112571. The reversal of 112561 is 165211.
It is a happy number.
112561 is nontrivially palindromic in base 16.
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 a cyclic number.
It is not a de Polignac number, because 112561 - 21 = 112559 is a prime.
It is the 336-th Hogben number.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (112501) by changing a digit.
It is a nontrivial repunit in base 335.
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, 1785 + ... + 1846.
It is an arithmetic number, because the mean of its divisors is an integer number (29056).
2112561 is an apocalyptic number.
It is an amenable number.
112561 is a deficient number, since it is larger than the sum of its proper divisors (3663).
112561 is an equidigital number, since it uses as much as digits as its factorization.
112561 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3662.
The product of its digits is 60, while the sum is 16.
The square root of 112561 is about 335.5011177329.
The cubic root of 112561 is about 48.2831928171.
Adding to 112561 its reverse (165211), we get a palindrome (277772).
Subtracting 112561 from its reverse (165211), we obtain a triangular number (52650 = T324).
The spelling of 112561 in words is "one hundred twelve thousand, five hundred sixty-one".