281383 has 4 divisors (see below), whose sum is σ = 288288. Its totient is φ = 274480.

The previous prime is 281381. The next prime is 281419. The reversal of 281383 is 383182.

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 281383 - 2¹ = 281381 is a prime.

It is an Ulam number.

It is a Duffinian number.

281383 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281381) 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, 3391 + ... + 3472.

It is an arithmetic number, because the mean of its divisors is an integer number (72072).

2²⁸¹³⁸³ is an apocalyptic number.

281383 is a deficient number, since it is larger than the sum of its proper divisors (6905).

281383 is an equidigital number, since it uses as much as digits as its factorization.

281383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6904.

The product of its digits is 1152, while the sum is 25.

The square root of 281383 is about 530.4554646716. The cubic root of 281383 is about 65.5288608901.

The spelling of 281383 in words is "two hundred eighty-one thousand, three hundred eighty-three".