16330891 has 4 divisors (see below), whose sum is σ = 16349400. Its totient is φ = 16312384.

The previous prime is 16330879. The next prime is 16330907. The reversal of 16330891 is 19803361.

16330891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19803361 = 167 ⋅118583.

It is a cyclic number.

It is not a de Polignac number, because 16330891 - 2¹¹ = 16328843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16330871) 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, 7861 + ... + 9718.

It is an arithmetic number, because the mean of its divisors is an integer number (4087350).

Almost surely, 2^16330891 is an apocalyptic number.

16330891 is a deficient number, since it is larger than the sum of its proper divisors (18509).

16330891 is an equidigital number, since it uses as much as digits as its factorization.

16330891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18508.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 16330891 is about 4041.1497126437. The cubic root of 16330891 is about 253.7094399973.

The spelling of 16330891 in words is "sixteen million, three hundred thirty thousand, eight hundred ninety-one".