112781 has 4 divisors (see below), whose sum is σ = 116700. Its totient is φ = 108864.

The previous prime is 112771. The next prime is 112787. The reversal of 112781 is 187211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 42025 = 266^2 + 205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-112781 is a prime.

It is a super-2 number, since 2×112781² = 25439107922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112787) 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, 1916 + ... + 1973.

It is an arithmetic number, because the mean of its divisors is an integer number (29175).

2¹¹²⁷⁸¹ is an apocalyptic number.

It is an amenable number.

112781 is a deficient number, since it is larger than the sum of its proper divisors (3919).

112781 is an equidigital number, since it uses as much as digits as its factorization.

112781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3918.

The product of its digits is 112, while the sum is 20.

The square root of 112781 is about 335.8288254453. The cubic root of 112781 is about 48.3146287778.

Adding to 112781 its reverse (187211), we get a palindrome (299992).

The spelling of 112781 in words is "one hundred twelve thousand, seven hundred eighty-one".