19944243029 has 2 divisors, whose sum is σ = 19944243030. Its totient is φ = 19944243028.

The previous prime is 19944243017. The next prime is 19944243083. The reversal of 19944243029 is 92034244991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17688468004 + 2255775025 = 132998^2 + 47495^2 .

It is a cyclic number.

It is not a de Polignac number, because 19944243029 - 2⁴ = 19944243013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19944243929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9972121514 + 9972121515.

It is an arithmetic number, because the mean of its divisors is an integer number (9972121515).

Almost surely, 2^19944243029 is an apocalyptic number.

It is an amenable number.

19944243029 is a deficient number, since it is larger than the sum of its proper divisors (1).

19944243029 is an equidigital number, since it uses as much as digits as its factorization.

19944243029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 19944243029 in words is "nineteen billion, nine hundred forty-four million, two hundred forty-three thousand, twenty-nine".