319381 has 4 divisors (see below), whose sum is σ = 320812. Its totient is φ = 317952.

The previous prime is 319357. The next prime is 319387. The reversal of 319381 is 183913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183913 = 353 ⋅521.

It can be written as a sum of positive squares in 2 ways, for example, as 152100 + 167281 = 390^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 319381 - 2¹¹ = 317333 is a prime.

It is a super-2 number, since 2×319381² = 204008446322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (319387) 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, 300 + ... + 853.

It is an arithmetic number, because the mean of its divisors is an integer number (80203).

2³¹⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

319381 is a deficient number, since it is larger than the sum of its proper divisors (1431).

319381 is a wasteful number, since it uses less digits than its factorization.

319381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430.

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

The square root of 319381 is about 565.1380362354. The cubic root of 319381 is about 68.3549062695.

The spelling of 319381 in words is "three hundred nineteen thousand, three hundred eighty-one".