16193891 has 4 divisors (see below), whose sum is σ = 18507312. Its totient is φ = 13880472.

The previous prime is 16193869. The next prime is 16193921. The reversal of 16193891 is 19839161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19839161 = 29 ⋅684109.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16193891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16193831) 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, 1156700 + ... + 1156713.

It is an arithmetic number, because the mean of its divisors is an integer number (4626828).

Almost surely, 2^16193891 is an apocalyptic number.

16193891 is a deficient number, since it is larger than the sum of its proper divisors (2313421).

16193891 is an equidigital number, since it uses as much as digits as its factorization.

16193891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313420.

The product of its digits is 11664, while the sum is 38.

The square root of 16193891 is about 4024.1633913150. The cubic root of 16193891 is about 252.9979898500.

The spelling of 16193891 in words is "sixteen million, one hundred ninety-three thousand, eight hundred ninety-one".