191794202089 has 4 divisors (see below), whose sum is σ = 219193373824. Its totient is φ = 164395030356.

The previous prime is 191794202069. The next prime is 191794202099. The reversal of 191794202089 is 980202497191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191794202089 - 2²⁵ = 191760647657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191794202069) 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, 13699585857 + ... + 13699585870.

It is an arithmetic number, because the mean of its divisors is an integer number (54798343456).

Almost surely, 2^191794202089 is an apocalyptic number.

It is an amenable number.

191794202089 is a deficient number, since it is larger than the sum of its proper divisors (27399171735).

191794202089 is an equidigital number, since it uses as much as digits as its factorization.

191794202089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27399171734.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 191794202089 in words is "one hundred ninety-one billion, seven hundred ninety-four million, two hundred two thousand, eighty-nine".