19387049249 has 2 divisors, whose sum is σ = 19387049250. Its totient is φ = 19387049248.

The previous prime is 19387049159. The next prime is 19387049257. The reversal of 19387049249 is 94294078391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13681513024 + 5705536225 = 116968^2 + 75535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19387049249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19387049194 and 19387049203.

It is not a weakly prime, because it can be changed into another prime (19387349249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9693524624 + 9693524625.

It is an arithmetic number, because the mean of its divisors is an integer number (9693524625).

Almost surely, 2^19387049249 is an apocalyptic number.

It is an amenable number.

19387049249 is a deficient number, since it is larger than the sum of its proper divisors (1).

19387049249 is an equidigital number, since it uses as much as digits as its factorization.

19387049249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 19387049249 in words is "nineteen billion, three hundred eighty-seven million, forty-nine thousand, two hundred forty-nine".