19219709 has 2 divisors, whose sum is σ = 19219710. Its totient is φ = 19219708.

The previous prime is 19219703. The next prime is 19219747. The reversal of 19219709 is 90791291.

It is an a-pointer prime, because the next prime (19219747) can be obtained adding 19219709 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 7963684 = 3355^2 + 2822^2 .

It is a cyclic number.

It is not a de Polignac number, because 19219709 - 2¹² = 19215613 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19219703) 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, 9609854 + 9609855.

It is an arithmetic number, because the mean of its divisors is an integer number (9609855).

Almost surely, 2^19219709 is an apocalyptic number.

It is an amenable number.

19219709 is a deficient number, since it is larger than the sum of its proper divisors (1).

19219709 is an equidigital number, since it uses as much as digits as its factorization.

19219709 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 19219709 is about 4384.0288548320. The cubic root of 19219709 is about 267.8647726859.

The spelling of 19219709 in words is "nineteen million, two hundred nineteen thousand, seven hundred nine".