19928991041 has 2 divisors, whose sum is σ = 19928991042. Its totient is φ = 19928991040.

The previous prime is 19928990993. The next prime is 19928991067. The reversal of 19928991041 is 14019982991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19492348225 + 436642816 = 139615^2 + 20896^2 .

It is a cyclic number.

It is not a de Polignac number, because 19928991041 - 2¹⁰ = 19928990017 is a prime.

It is not a weakly prime, because it can be changed into another prime (19928990041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9964495520 + 9964495521.

It is an arithmetic number, because the mean of its divisors is an integer number (9964495521).

Almost surely, 2^19928991041 is an apocalyptic number.

It is an amenable number.

19928991041 is a deficient number, since it is larger than the sum of its proper divisors (1).

19928991041 is an equidigital number, since it uses as much as digits as its factorization.

19928991041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 53.

The spelling of 19928991041 in words is "nineteen billion, nine hundred twenty-eight million, nine hundred ninety-one thousand, forty-one".