19113902161 has 2 divisors, whose sum is σ = 19113902162. Its totient is φ = 19113902160.

The previous prime is 19113902153. The next prime is 19113902177. The reversal of 19113902161 is 16120931191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18942292161 + 171610000 = 137631^2 + 13100^2 .

It is a cyclic number.

It is not a de Polignac number, because 19113902161 - 2³ = 19113902153 is a prime.

It is not a weakly prime, because it can be changed into another prime (19113902761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9556951080 + 9556951081.

It is an arithmetic number, because the mean of its divisors is an integer number (9556951081).

Almost surely, 2^19113902161 is an apocalyptic number.

It is an amenable number.

19113902161 is a deficient number, since it is larger than the sum of its proper divisors (1).

19113902161 is an equidigital number, since it uses as much as digits as its factorization.

19113902161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 19113902161 in words is "nineteen billion, one hundred thirteen million, nine hundred two thousand, one hundred sixty-one".