19191510853 has 2 divisors, whose sum is σ = 19191510854. Its totient is φ = 19191510852.

The previous prime is 19191510839. The next prime is 19191510869. The reversal of 19191510853 is 35801519191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14023770084 + 5167740769 = 118422^2 + 71887^2 .

It is an emirp because it is prime and its reverse (35801519191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19191510853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19191510883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9595755426 + 9595755427.

It is an arithmetic number, because the mean of its divisors is an integer number (9595755427).

Almost surely, 2^19191510853 is an apocalyptic number.

It is an amenable number.

19191510853 is a deficient number, since it is larger than the sum of its proper divisors (1).

19191510853 is an equidigital number, since it uses as much as digits as its factorization.

19191510853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 43.

The spelling of 19191510853 in words is "nineteen billion, one hundred ninety-one million, five hundred ten thousand, eight hundred fifty-three".