281361 has 4 divisors (see below), whose sum is σ = 375152. Its totient is φ = 187572.

The previous prime is 281357. The next prime is 281363. The reversal of 281361 is 163182.

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 not a de Polignac number, because 281361 - 2² = 281357 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281363) 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, 46891 + ... + 46896.

It is an arithmetic number, because the mean of its divisors is an integer number (93788).

2²⁸¹³⁶¹ is an apocalyptic number.

It is an amenable number.

281361 is a deficient number, since it is larger than the sum of its proper divisors (93791).

281361 is an equidigital number, since it uses as much as digits as its factorization.

281361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93790.

The product of its digits is 288, while the sum is 21.

The square root of 281361 is about 530.4347273699. The cubic root of 281361 is about 65.5271530488.

The spelling of 281361 in words is "two hundred eighty-one thousand, three hundred sixty-one".