281365 has 8 divisors (see below), whose sum is σ = 385920. Its totient is φ = 192912.

The previous prime is 281363. The next prime is 281381. The reversal of 281365 is 563182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 281365 - 2¹ = 281363 is a prime.

281365 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3985 + ... + 4054.

It is an arithmetic number, because the mean of its divisors is an integer number (48240).

2²⁸¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

281365 is a deficient number, since it is larger than the sum of its proper divisors (104555).

281365 is an equidigital number, since it uses as much as digits as its factorization.

281365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8051.

The product of its digits is 1440, while the sum is 25.

The square root of 281365 is about 530.4384978487. The cubic root of 281365 is about 65.5274635720.

It can be divided in two parts, 281 and 365, that added together give a palindrome (646).

The spelling of 281365 in words is "two hundred eighty-one thousand, three hundred sixty-five".