319813 has 8 divisors (see below), whose sum is σ = 350168. Its totient is φ = 290304.

The previous prime is 319811. The next prime is 319817. The reversal of 319813 is 318913.

It can be written as a sum of positive squares in 4 ways, for example, as 3969 + 315844 = 63^2 + 562^2 .

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 319813 - 2¹ = 319811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (319811) 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, 781 + ... + 1117.

It is an arithmetic number, because the mean of its divisors is an integer number (43771).

2³¹⁹⁸¹³ is an apocalyptic number.

It is an amenable number.

319813 is a deficient number, since it is larger than the sum of its proper divisors (30355).

319813 is a wasteful number, since it uses less digits than its factorization.

319813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423.

The product of its digits is 648, while the sum is 25.

The square root of 319813 is about 565.5201145848. The cubic root of 319813 is about 68.3857117083.

Subtracting from 319813 its reverse (318913), we obtain a square (900 = 30²).

The spelling of 319813 in words is "three hundred nineteen thousand, eight hundred thirteen".