2191804236379 has 2 divisors, whose sum is σ = 2191804236380. Its totient is φ = 2191804236378.

The previous prime is 2191804236373. The next prime is 2191804236437. The reversal of 2191804236379 is 9736324081912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2191804236379 - 2¹⁷ = 2191804105307 is a prime.

It is not a weakly prime, because it can be changed into another prime (2191804236373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095902118189 + 1095902118190.

It is an arithmetic number, because the mean of its divisors is an integer number (1095902118190).

Almost surely, 2^{2191804236379} is an apocalyptic number.

2191804236379 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191804236379 is an equidigital number, since it uses as much as digits as its factorization.

2191804236379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 2191804236379 in words is "two trillion, one hundred ninety-one billion, eight hundred four million, two hundred thirty-six thousand, three hundred seventy-nine".