319281 has 4 divisors (see below), whose sum is σ = 425712. Its totient is φ = 212852.

The previous prime is 319279. The next prime is 319289. The reversal of 319281 is 182913.

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 a cyclic number.

It is not a de Polignac number, because 319281 - 2¹ = 319279 is a prime.

It is a super-2 number, since 2×319281² = 203880713922, which contains 22 as substring.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 319281.

It is not an unprimeable number, because it can be changed into a prime (319289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53211 + ... + 53216.

It is an arithmetic number, because the mean of its divisors is an integer number (106428).

2³¹⁹²⁸¹ is an apocalyptic number.

It is an amenable number.

319281 is a deficient number, since it is larger than the sum of its proper divisors (106431).

319281 is a wasteful number, since it uses less digits than its factorization.

319281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106430.

The product of its digits is 432, while the sum is 24.

The square root of 319281 is about 565.0495553489. The cubic root of 319281 is about 68.3477714220.

The spelling of 319281 in words is "three hundred nineteen thousand, two hundred eighty-one".