331689 has 4 divisors (see below), whose sum is σ = 442256. Its totient is φ = 221124.

The previous prime is 331663. The next prime is 331691. The reversal of 331689 is 986133.

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 not a de Polignac number, because 331689 - 2¹⁶ = 266153 is a prime.

It is a super-2 number, since 2×331689² = 220035185442, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331689.

It is not an unprimeable number, because it can be changed into a prime (331609) 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, 55279 + ... + 55284.

It is an arithmetic number, because the mean of its divisors is an integer number (110564).

2³³¹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

331689 is a deficient number, since it is larger than the sum of its proper divisors (110567).

331689 is a wasteful number, since it uses less digits than its factorization.

331689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110566.

The product of its digits is 3888, while the sum is 30.

The square root of 331689 is about 575.9244742152. The cubic root of 331689 is about 69.2219277408.

The spelling of 331689 in words is "three hundred thirty-one thousand, six hundred eighty-nine".