16331 has 4 divisors (see below), whose sum is σ = 18672. Its totient is φ = 13992.

The previous prime is 16319. The next prime is 16333. The reversal of 16331 is 13361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13361 = 31 ⋅431.

It is a cyclic number.

It is not a de Polignac number, because 16331 - 2⁶ = 16267 is a prime.

It is a super-2 number, since 2×16331² = 533403122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (16333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1160 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (4668).

2¹⁶³³¹ is an apocalyptic number.

16331 is a deficient number, since it is larger than the sum of its proper divisors (2341).

16331 is an equidigital number, since it uses as much as digits as its factorization.

16331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340.

The product of its digits is 54, while the sum is 14.

The square root of 16331 is about 127.7928010492. The cubic root of 16331 is about 25.3710004454.

Adding to 16331 its reverse (13361), we get a palindrome (29692).

The spelling of 16331 in words is "sixteen thousand, three hundred thirty-one".