16397191 has 2 divisors, whose sum is σ = 16397192. Its totient is φ = 16397190.

The previous prime is 16397189. The next prime is 16397207. The reversal of 16397191 is 19179361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16397191 - 2¹ = 16397189 is a prime.

Together with 16397189, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16397191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16397141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8198595 + 8198596.

It is an arithmetic number, because the mean of its divisors is an integer number (8198596).

Almost surely, 2^16397191 is an apocalyptic number.

16397191 is a deficient number, since it is larger than the sum of its proper divisors (1).

16397191 is an equidigital number, since it uses as much as digits as its factorization.

16397191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 37.

The square root of 16397191 is about 4049.3445148567. The cubic root of 16397191 is about 254.0523121634.

The spelling of 16397191 in words is "sixteen million, three hundred ninety-seven thousand, one hundred ninety-one".