191098838947 has 4 divisors (see below), whose sum is σ = 191099717640. Its totient is φ = 191097960256.

The previous prime is 191098838897. The next prime is 191098838977. The reversal of 191098838947 is 749838890191.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 749838890191 = 719203 ⋅1042597.

It is a cyclic number.

It is not a de Polignac number, because 191098838947 - 2²³ = 191090450339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191098838977) 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, 153843 + ... + 637075.

It is an arithmetic number, because the mean of its divisors is an integer number (47774929410).

Almost surely, 2^191098838947 is an apocalyptic number.

191098838947 is a deficient number, since it is larger than the sum of its proper divisors (878693).

191098838947 is an equidigital number, since it uses as much as digits as its factorization.

191098838947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878692.

The product of its (nonzero) digits is 31352832, while the sum is 67.

The spelling of 191098838947 in words is "one hundred ninety-one billion, ninety-eight million, eight hundred thirty-eight thousand, nine hundred forty-seven".