19973038249 has 2 divisors, whose sum is σ = 19973038250. Its totient is φ = 19973038248.

The previous prime is 19973038219. The next prime is 19973038291. The reversal of 19973038249 is 94283037991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11406240000 + 8566798249 = 106800^2 + 92557^2 .

It is a cyclic number.

It is not a de Polignac number, because 19973038249 - 2⁹ = 19973037737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19973038249.

It is not a weakly prime, because it can be changed into another prime (19973038219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9986519124 + 9986519125.

It is an arithmetic number, because the mean of its divisors is an integer number (9986519125).

Almost surely, 2^19973038249 is an apocalyptic number.

It is an amenable number.

19973038249 is a deficient number, since it is larger than the sum of its proper divisors (1).

19973038249 is an equidigital number, since it uses as much as digits as its factorization.

19973038249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 19973038249 in words is "nineteen billion, nine hundred seventy-three million, thirty-eight thousand, two hundred forty-nine".