19019982991 has 4 divisors (see below), whose sum is σ = 19047508984. Its totient is φ = 18992457000.

The previous prime is 19019982953. The next prime is 19019983019. The reversal of 19019982991 is 19928991091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19928991091 = 421 ⋅47337271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19019982991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19019982391) 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, 13761960 + ... + 13763341.

It is an arithmetic number, because the mean of its divisors is an integer number (4761877246).

Almost surely, 2^19019982991 is an apocalyptic number.

19019982991 is a deficient number, since it is larger than the sum of its proper divisors (27525993).

19019982991 is an equidigital number, since it uses as much as digits as its factorization.

19019982991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27525992.

The product of its (nonzero) digits is 944784, while the sum is 58.

The spelling of 19019982991 in words is "nineteen billion, nineteen million, nine hundred eighty-two thousand, nine hundred ninety-one".