19519163009 has 2 divisors, whose sum is σ = 19519163010. Its totient is φ = 19519163008.

The previous prime is 19519162991. The next prime is 19519163029. The reversal of 19519163009 is 90036191591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19516090000 + 3073009 = 139700^2 + 1753^2 .

It is an emirp because it is prime and its reverse (90036191591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19519163009 - 2¹² = 19519158913 is a prime.

It is not a weakly prime, because it can be changed into another prime (19519163029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9759581504 + 9759581505.

It is an arithmetic number, because the mean of its divisors is an integer number (9759581505).

Almost surely, 2^19519163009 is an apocalyptic number.

It is an amenable number.

19519163009 is a deficient number, since it is larger than the sum of its proper divisors (1).

19519163009 is an equidigital number, since it uses as much as digits as its factorization.

19519163009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 44.

The spelling of 19519163009 in words is "nineteen billion, five hundred nineteen million, one hundred sixty-three thousand, nine".