19871219 has 2 divisors, whose sum is σ = 19871220. Its totient is φ = 19871218.

The previous prime is 19871213. The next prime is 19871227. The reversal of 19871219 is 91217891.

It is a weak prime.

It is an emirp because it is prime and its reverse (91217891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19871219 is a prime.

It is a super-2 number, since 2×19871219² = 789730689091922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19871213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9935609 + 9935610.

It is an arithmetic number, because the mean of its divisors is an integer number (9935610).

Almost surely, 2^19871219 is an apocalyptic number.

19871219 is a deficient number, since it is larger than the sum of its proper divisors (1).

19871219 is an equidigital number, since it uses as much as digits as its factorization.

19871219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 38.

The square root of 19871219 is about 4457.7145489589. The cubic root of 19871219 is about 270.8578976589.

It can be divided in two parts, 198 and 71219, that added together give a palindrome (71417).

The spelling of 19871219 in words is "nineteen million, eight hundred seventy-one thousand, two hundred nineteen".