19000020019 has 4 divisors (see below), whose sum is σ = 19213503480. Its totient is φ = 18786536560.

The previous prime is 19000019999. The next prime is 19000020071. The reversal of 19000020019 is 91002000091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19000020019 - 2¹³ = 19000011827 is a prime.

It is a super-2 number, since 2×19000020019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19000020089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106741597 + ... + 106741774.

It is an arithmetic number, because the mean of its divisors is an integer number (4803375870).

Almost surely, 2^19000020019 is an apocalyptic number.

19000020019 is a deficient number, since it is larger than the sum of its proper divisors (213483461).

19000020019 is an equidigital number, since it uses as much as digits as its factorization.

19000020019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213483460.

The product of its (nonzero) digits is 162, while the sum is 22.

The spelling of 19000020019 in words is "nineteen billion, twenty thousand, nineteen".