16191971 has 8 divisors (see below), whose sum is σ = 17169600. Its totient is φ = 15226920.

The previous prime is 16191961. The next prime is 16191997. The reversal of 16191971 is 17919161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16191971 - 2¹⁰ = 16190947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16191941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425 + ... + 5706.

It is an arithmetic number, because the mean of its divisors is an integer number (2146200).

Almost surely, 2^16191971 is an apocalyptic number.

16191971 is a deficient number, since it is larger than the sum of its proper divisors (977629).

16191971 is a wasteful number, since it uses less digits than its factorization.

16191971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289.

The product of its digits is 3402, while the sum is 35.

The square root of 16191971 is about 4023.9248253415. The cubic root of 16191971 is about 252.9879907020.

The spelling of 16191971 in words is "sixteen million, one hundred ninety-one thousand, nine hundred seventy-one".