281312 has 24 divisors (see below), whose sum is σ = 567000. Its totient is φ = 137344.

The previous prime is 281297. The next prime is 281317. The reversal of 281312 is 213182.

It is a plaindrome in base 9.

It is a zygodrome in base 5.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281312.

It is not an unprimeable number, because it can be changed into a prime (281317) by changing a digit.

281312 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 1814 + ... + 1962.

It is an arithmetic number, because the mean of its divisors is an integer number (23625).

2²⁸¹³¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283500).

281312 is an abundant number, since it is smaller than the sum of its proper divisors (285688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

281312 is a wasteful number, since it uses less digits than its factorization.

281312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 210 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 281312 is about 530.3885368294. The cubic root of 281312 is about 65.5233489005.

Adding to 281312 its reverse (213182), we get a palindrome (494494).

The spelling of 281312 in words is "two hundred eighty-one thousand, three hundred twelve".