15997171 has 4 divisors (see below), whose sum is σ = 16189992. Its totient is φ = 15804352.

The previous prime is 15997169. The next prime is 15997181. The reversal of 15997171 is 17179951.

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 15997171 - 2¹ = 15997169 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15997151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96286 + ... + 96451.

It is an arithmetic number, because the mean of its divisors is an integer number (4047498).

Almost surely, 2^15997171 is an apocalyptic number.

15997171 is a deficient number, since it is larger than the sum of its proper divisors (192821).

15997171 is an equidigital number, since it uses as much as digits as its factorization.

15997171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192820.

The product of its digits is 19845, while the sum is 40.

The square root of 15997171 is about 3999.6463593673. The cubic root of 15997171 is about 251.9693577842.

The spelling of 15997171 in words is "fifteen million, nine hundred ninety-seven thousand, one hundred seventy-one".