19316909 has 2 divisors, whose sum is σ = 19316910. Its totient is φ = 19316908.

The previous prime is 19316903. The next prime is 19316911. The reversal of 19316909 is 90961391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 7171684 = 3485^2 + 2678^2 .

It is an emirp because it is prime and its reverse (90961391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19316909 - 2⁴ = 19316893 is a prime.

Together with 19316911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19316903) 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, 9658454 + 9658455.

It is an arithmetic number, because the mean of its divisors is an integer number (9658455).

Almost surely, 2^19316909 is an apocalyptic number.

It is an amenable number.

19316909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19316909 is an equidigital number, since it uses as much as digits as its factorization.

19316909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 19316909 is about 4395.1005676776. The cubic root of 19316909 is about 268.3155718690.

The spelling of 19316909 in words is "nineteen million, three hundred sixteen thousand, nine hundred nine".