19716001 has 2 divisors, whose sum is σ = 19716002. Its totient is φ = 19716000.

The previous prime is 19715999. The next prime is 19716007. The reversal of 19716001 is 10061791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 2401 = 4440^2 + 49^2 .

It is an emirp because it is prime and its reverse (10061791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19716001 - 2¹ = 19715999 is a prime.

Together with 19715999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19716007) 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, 9858000 + 9858001.

It is an arithmetic number, because the mean of its divisors is an integer number (9858001).

Almost surely, 2^19716001 is an apocalyptic number.

It is an amenable number.

19716001 is a deficient number, since it is larger than the sum of its proper divisors (1).

19716001 is an equidigital number, since it uses as much as digits as its factorization.

19716001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 19716001 is about 4440.2703746506. The cubic root of 19716001 is about 270.1508119512.

Adding to 19716001 its reverse (10061791), we get a palindrome (29777792).

The spelling of 19716001 in words is "nineteen million, seven hundred sixteen thousand, one".