19869019 has 2 divisors, whose sum is σ = 19869020. Its totient is φ = 19869018.

The previous prime is 19868977. The next prime is 19869029. The reversal of 19869019 is 91096891.

It is a strong prime.

It is an emirp because it is prime and its reverse (91096891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19869019 - 2¹¹ = 19866971 is a prime.

It is a super-2 number, since 2×19869019² = 789555832044722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19869029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9934509 + 9934510.

It is an arithmetic number, because the mean of its divisors is an integer number (9934510).

Almost surely, 2^19869019 is an apocalyptic number.

19869019 is a deficient number, since it is larger than the sum of its proper divisors (1).

19869019 is an equidigital number, since it uses as much as digits as its factorization.

19869019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 19869019 is about 4457.4677789077. The cubic root of 19869019 is about 270.8479014701.

The spelling of 19869019 in words is "nineteen million, eight hundred sixty-nine thousand, nineteen".