19105403549 has 2 divisors, whose sum is σ = 19105403550. Its totient is φ = 19105403548.

The previous prime is 19105403543. The next prime is 19105403567. The reversal of 19105403549 is 94530450191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15902975449 + 3202428100 = 126107^2 + 56590^2 .

It is a cyclic number.

It is not a de Polignac number, because 19105403549 - 2⁸ = 19105403293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19105403543) 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, 9552701774 + 9552701775.

It is an arithmetic number, because the mean of its divisors is an integer number (9552701775).

Almost surely, 2^19105403549 is an apocalyptic number.

It is an amenable number.

19105403549 is a deficient number, since it is larger than the sum of its proper divisors (1).

19105403549 is an equidigital number, since it uses as much as digits as its factorization.

19105403549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 41.

The spelling of 19105403549 in words is "nineteen billion, one hundred five million, four hundred three thousand, five hundred forty-nine".