19964159 has 2 divisors, whose sum is σ = 19964160. Its totient is φ = 19964158.

The previous prime is 19964149. The next prime is 19964173. The reversal of 19964159 is 95146991.

It is a weak prime.

It is an emirp because it is prime and its reverse (95146991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19964159 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19964129) 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 as a sum of consecutive naturals, namely, 9982079 + 9982080.

It is an arithmetic number, because the mean of its divisors is an integer number (9982080).

Almost surely, 2^19964159 is an apocalyptic number.

19964159 is a deficient number, since it is larger than the sum of its proper divisors (1).

19964159 is an equidigital number, since it uses as much as digits as its factorization.

19964159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 44.

The square root of 19964159 is about 4468.1270125188. The cubic root of 19964159 is about 271.2795189689.

The spelling of 19964159 in words is "nineteen million, nine hundred sixty-four thousand, one hundred fifty-nine".