331989 has 8 divisors (see below), whose sum is σ = 505920. Its totient is φ = 189696.

The previous prime is 331973. The next prime is 331997. The reversal of 331989 is 989133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 331989 - 2⁴ = 331973 is a prime.

It is a super-2 number, since 2×331989² = 220433392242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331989.

It is not an unprimeable number, because it can be changed into a prime (331909) 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, 7884 + ... + 7925.

It is an arithmetic number, because the mean of its divisors is an integer number (63240).

2³³¹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

331989 is a deficient number, since it is larger than the sum of its proper divisors (173931).

331989 is a wasteful number, since it uses less digits than its factorization.

331989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15819.

The product of its digits is 5832, while the sum is 33.

The square root of 331989 is about 576.1848661671. The cubic root of 331989 is about 69.2427909798.

The spelling of 331989 in words is "three hundred thirty-one thousand, nine hundred eighty-nine".