19965019 has 2 divisors, whose sum is σ = 19965020. Its totient is φ = 19965018.

The previous prime is 19965013. The next prime is 19965041. The reversal of 19965019 is 91056991.

It is a weak prime.

It is an emirp because it is prime and its reverse (91056991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19965019 - 2¹⁹ = 19440731 is a prime.

It is a super-2 number, since 2×19965019² = 797203967340722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19965013) 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, 9982509 + 9982510.

It is an arithmetic number, because the mean of its divisors is an integer number (9982510).

Almost surely, 2^19965019 is an apocalyptic number.

19965019 is a deficient number, since it is larger than the sum of its proper divisors (1).

19965019 is an equidigital number, since it uses as much as digits as its factorization.

19965019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 19965019 is about 4468.2232486750. The cubic root of 19965019 is about 271.2834142333.

The spelling of 19965019 in words is "nineteen million, nine hundred sixty-five thousand, nineteen".