331393 has 4 divisors (see below), whose sum is σ = 332848. Its totient is φ = 329940.

The previous prime is 331391. The next prime is 331399. The reversal of 331393 is 393133.

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, and also an emirpimes, since its reverse is a distinct semiprime: 393133 = 13 ⋅30241.

It is a cyclic number.

It is not a de Polignac number, because 331393 - 2¹ = 331391 is a prime.

It is an Ulam number.

It is a Duffinian number.

331393 is a lucky number.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331393.

It is not an unprimeable number, because it can be changed into a prime (331391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303 + ... + 868.

It is an arithmetic number, because the mean of its divisors is an integer number (83212).

2³³¹³⁹³ is an apocalyptic number.

It is an amenable number.

331393 is a deficient number, since it is larger than the sum of its proper divisors (1455).

331393 is a wasteful number, since it uses less digits than its factorization.

331393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454.

The product of its digits is 729, while the sum is 22.

The square root of 331393 is about 575.6674387179. The cubic root of 331393 is about 69.2013303452.

The spelling of 331393 in words is "three hundred thirty-one thousand, three hundred ninety-three".