19709219 has 2 divisors, whose sum is σ = 19709220. Its totient is φ = 19709218.

The previous prime is 19709203. The next prime is 19709243. The reversal of 19709219 is 91290791.

It is a weak prime.

It is an emirp because it is prime and its reverse (91290791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19709219 - 2⁴ = 19709203 is a prime.

It is a super-2 number, since 2×19709219² = 776906627179922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19709279) 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, 9854609 + 9854610.

It is an arithmetic number, because the mean of its divisors is an integer number (9854610).

Almost surely, 2^19709219 is an apocalyptic number.

19709219 is a deficient number, since it is larger than the sum of its proper divisors (1).

19709219 is an equidigital number, since it uses as much as digits as its factorization.

19709219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 19709219 is about 4439.5066167312. The cubic root of 19709219 is about 270.1198324957.

The spelling of 19709219 in words is "nineteen million, seven hundred nine thousand, two hundred nineteen".