16195591 has 2 divisors, whose sum is σ = 16195592. Its totient is φ = 16195590.

The previous prime is 16195579. The next prime is 16195631. The reversal of 16195591 is 19559161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16195591 - 2¹³ = 16187399 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16195591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16195691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8097795 + 8097796.

It is an arithmetic number, because the mean of its divisors is an integer number (8097796).

Almost surely, 2^16195591 is an apocalyptic number.

16195591 is a deficient number, since it is larger than the sum of its proper divisors (1).

16195591 is an equidigital number, since it uses as much as digits as its factorization.

16195591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12150, while the sum is 37.

The square root of 16195591 is about 4024.3746097996. The cubic root of 16195591 is about 253.0068426027.

The spelling of 16195591 in words is "sixteen million, one hundred ninety-five thousand, five hundred ninety-one".