19138612849 has 2 divisors, whose sum is σ = 19138612850. Its totient is φ = 19138612848.

The previous prime is 19138612819. The next prime is 19138612907. The reversal of 19138612849 is 94821683191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15223858225 + 3914754624 = 123385^2 + 62568^2 .

It is a cyclic number.

It is not a de Polignac number, because 19138612849 - 2¹³ = 19138604657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19138612796 and 19138612805.

It is not a weakly prime, because it can be changed into another prime (19138612819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9569306424 + 9569306425.

It is an arithmetic number, because the mean of its divisors is an integer number (9569306425).

Almost surely, 2^19138612849 is an apocalyptic number.

It is an amenable number.

19138612849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19138612849 is an equidigital number, since it uses as much as digits as its factorization.

19138612849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 52.

The spelling of 19138612849 in words is "nineteen billion, one hundred thirty-eight million, six hundred twelve thousand, eight hundred forty-nine".