16671191 has 4 divisors (see below), whose sum is σ = 16798584. Its totient is φ = 16543800.

The previous prime is 16671181. The next prime is 16671199. The reversal of 16671191 is 19117661.

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 16671191 - 2²² = 12476887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16671199) 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, 63500 + ... + 63761.

It is an arithmetic number, because the mean of its divisors is an integer number (4199646).

Almost surely, 2^16671191 is an apocalyptic number.

16671191 is a deficient number, since it is larger than the sum of its proper divisors (127393).

16671191 is a wasteful number, since it uses less digits than its factorization.

16671191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127392.

The product of its digits is 2268, while the sum is 32.

The square root of 16671191 is about 4083.0369824433. The cubic root of 16671191 is about 255.4595889688.

The spelling of 16671191 in words is "sixteen million, six hundred seventy-one thousand, one hundred ninety-one".