281347 has 4 divisors (see below), whose sum is σ = 306936. Its totient is φ = 255760.

The previous prime is 281339. The next prime is 281353. The reversal of 281347 is 743182.

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

It is a cyclic number.

It is not a de Polignac number, because 281347 - 2³ = 281339 is a prime.

It is a super-2 number, since 2×281347² = 158312268818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281317) 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, 12778 + ... + 12799.

It is an arithmetic number, because the mean of its divisors is an integer number (76734).

2²⁸¹³⁴⁷ is an apocalyptic number.

281347 is a deficient number, since it is larger than the sum of its proper divisors (25589).

281347 is a wasteful number, since it uses less digits than its factorization.

281347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25588.

The product of its digits is 1344, while the sum is 25.

The square root of 281347 is about 530.4215304831. The cubic root of 281347 is about 65.5260661944.

The spelling of 281347 in words is "two hundred eighty-one thousand, three hundred forty-seven".