19121084617 has 2 divisors, whose sum is σ = 19121084618. Its totient is φ = 19121084616.

The previous prime is 19121084581. The next prime is 19121084651. The reversal of 19121084617 is 71648012191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19083764736 + 37319881 = 138144^2 + 6109^2 .

It is a cyclic number.

It is not a de Polignac number, because 19121084617 - 2¹¹ = 19121082569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19121084617.

It is not a weakly prime, because it can be changed into another prime (19121084687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9560542308 + 9560542309.

It is an arithmetic number, because the mean of its divisors is an integer number (9560542309).

Almost surely, 2^19121084617 is an apocalyptic number.

It is an amenable number.

19121084617 is a deficient number, since it is larger than the sum of its proper divisors (1).

19121084617 is an equidigital number, since it uses as much as digits as its factorization.

19121084617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 40.

The spelling of 19121084617 in words is "nineteen billion, one hundred twenty-one million, eighty-four thousand, six hundred seventeen".