16187197 has 4 divisors (see below), whose sum is σ = 17432380. Its totient is φ = 14942016.

The previous prime is 16187161. The next prime is 16187201. The reversal of 16187197 is 79178161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79178161 = 4957 ⋅15973.

It can be written as a sum of positive squares in 2 ways, for example, as 10106041 + 6081156 = 3179^2 + 2466^2 .

It is a cyclic number.

It is not a de Polignac number, because 16187197 - 2¹⁵ = 16154429 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 (16187117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622572 + ... + 622597.

It is an arithmetic number, because the mean of its divisors is an integer number (4358095).

Almost surely, 2^16187197 is an apocalyptic number.

It is an amenable number.

16187197 is a deficient number, since it is larger than the sum of its proper divisors (1245183).

16187197 is a wasteful number, since it uses less digits than its factorization.

16187197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245182.

The product of its digits is 21168, while the sum is 40.

The square root of 16187197 is about 4023.3315796737. The cubic root of 16187197 is about 252.9631248105.

It can be divided in two parts, 16187 and 197, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 16187197 in words is "sixteen million, one hundred eighty-seven thousand, one hundred ninety-seven".