19749051841 has 2 divisors, whose sum is σ = 19749051842. Its totient is φ = 19749051840.

The previous prime is 19749051787. The next prime is 19749051853. The reversal of 19749051841 is 14815094791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17186161216 + 2562890625 = 131096^2 + 50625^2 .

It is a cyclic number.

It is not a de Polignac number, because 19749051841 - 2⁷ = 19749051713 is a prime.

It is not a weakly prime, because it can be changed into another prime (19749051241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9874525920 + 9874525921.

It is an arithmetic number, because the mean of its divisors is an integer number (9874525921).

Almost surely, 2^19749051841 is an apocalyptic number.

It is an amenable number.

19749051841 is a deficient number, since it is larger than the sum of its proper divisors (1).

19749051841 is an equidigital number, since it uses as much as digits as its factorization.

19749051841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 19749051841 in words is "nineteen billion, seven hundred forty-nine million, fifty-one thousand, eight hundred forty-one".