19196956391 has 4 divisors (see below), whose sum is σ = 19238063832. Its totient is φ = 19155848952.

The previous prime is 19196956381. The next prime is 19196956397. The reversal of 19196956391 is 19365969191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19365969191 = 31583 ⋅613177.

It is a cyclic number.

It is not a de Polignac number, because 19196956391 - 2¹⁸ = 19196694247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19196956391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19196956397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20553020 + ... + 20553953.

It is an arithmetic number, because the mean of its divisors is an integer number (4809515958).

Almost surely, 2^19196956391 is an apocalyptic number.

19196956391 is a deficient number, since it is larger than the sum of its proper divisors (41107441).

19196956391 is an equidigital number, since it uses as much as digits as its factorization.

19196956391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41107440.

The product of its digits is 3542940, while the sum is 59.

The spelling of 19196956391 in words is "nineteen billion, one hundred ninety-six million, nine hundred fifty-six thousand, three hundred ninety-one".