16449891 has 4 divisors (see below), whose sum is σ = 21933192. Its totient is φ = 10966592.

The previous prime is 16449883. The next prime is 16449949. The reversal of 16449891 is 19894461.

16449891 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.

It is a cyclic number.

It is not a de Polignac number, because 16449891 - 2³ = 16449883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16449841) 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, 2741646 + ... + 2741651.

It is an arithmetic number, because the mean of its divisors is an integer number (5483298).

Almost surely, 2^16449891 is an apocalyptic number.

16449891 is a deficient number, since it is larger than the sum of its proper divisors (5483301).

16449891 is an equidigital number, since it uses as much as digits as its factorization.

16449891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5483300.

The product of its digits is 62208, while the sum is 42.

The square root of 16449891 is about 4055.8465207648. The cubic root of 16449891 is about 254.3241928563.

The spelling of 16449891 in words is "sixteen million, four hundred forty-nine thousand, eight hundred ninety-one".