16573891 has 4 divisors (see below), whose sum is σ = 17021872. Its totient is φ = 16125912.

The previous prime is 16573873. The next prime is 16573901. The reversal of 16573891 is 19837561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19837561 = 67 ⋅296083.

It is a cyclic number.

It is not a de Polignac number, because 16573891 - 2⁵ = 16573859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16573801) 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, 223935 + ... + 224008.

It is an arithmetic number, because the mean of its divisors is an integer number (4255468).

Almost surely, 2^16573891 is an apocalyptic number.

16573891 is a deficient number, since it is larger than the sum of its proper divisors (447981).

16573891 is an equidigital number, since it uses as much as digits as its factorization.

16573891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447980.

The product of its digits is 45360, while the sum is 40.

The square root of 16573891 is about 4071.1043956155. The cubic root of 16573891 is about 254.9616294951.

The spelling of 16573891 in words is "sixteen million, five hundred seventy-three thousand, eight hundred ninety-one".