19000000049 has 2 divisors, whose sum is σ = 19000000050. Its totient is φ = 19000000048.

The previous prime is 19000000031. The next prime is 19000000079. The reversal of 19000000049 is 94000000091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14358030625 + 4641969424 = 119825^2 + 68132^2 .

It is a cyclic number.

It is not a de Polignac number, because 19000000049 - 2²⁰ = 18998951473 is a prime.

It is a super-2 number, since 2×19000000049² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18999999970 and 19000000033.

It is not a weakly prime, because it can be changed into another prime (19000000079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9500000024 + 9500000025.

It is an arithmetic number, because the mean of its divisors is an integer number (9500000025).

Almost surely, 2^19000000049 is an apocalyptic number.

It is an amenable number.

19000000049 is a deficient number, since it is larger than the sum of its proper divisors (1).

19000000049 is an equidigital number, since it uses as much as digits as its factorization.

19000000049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 19000000049 in words is "nineteen billion, forty-nine", and thus it is an aban number and an uban number.