19219491291 has 96 divisors (see below), whose sum is σ = 35864801280. Its totient is φ = 8897898240.

The previous prime is 19219491289. The next prime is 19219491367.

19219491291 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 19219491291 - 2¹ = 19219491289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19219491291.

It is not an unprimeable number, because it can be changed into a prime (19219491281) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 947926 + ... + 967988.

It is an arithmetic number, because the mean of its divisors is an integer number (373591680).

Almost surely, 2^19219491291 is an apocalyptic number.

19219491291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19219491291 is a deficient number, since it is larger than the sum of its proper divisors (16645309989).

19219491291 is a wasteful number, since it uses less digits than its factorization.

19219491291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20137 (or 20126 counting only the distinct ones).

The product of its digits is 104976, while the sum is 48.

The spelling of 19219491291 in words is "nineteen billion, two hundred nineteen million, four hundred ninety-one thousand, two hundred ninety-one".