191093739121 has 4 divisors (see below), whose sum is σ = 191160628132. Its totient is φ = 191026850112.

The previous prime is 191093739113. The next prime is 191093739157. The reversal of 191093739121 is 121937390191.

191093739121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121937390191 = 137 ⋅890053943.

It can be written as a sum of positive squares in 2 ways, for example, as 60096071025 + 130997668096 = 245145^2 + 361936^2 .

It is a cyclic number.

It is not a de Polignac number, because 191093739121 - 2³ = 191093739113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191093733121) 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, 33440220 + ... + 33445933.

It is an arithmetic number, because the mean of its divisors is an integer number (47790157033).

Almost surely, 2^191093739121 is an apocalyptic number.

It is an amenable number.

191093739121 is a deficient number, since it is larger than the sum of its proper divisors (66889011).

191093739121 is an equidigital number, since it uses as much as digits as its factorization.

191093739121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66889010.

The product of its (nonzero) digits is 91854, while the sum is 46.

The spelling of 191093739121 in words is "one hundred ninety-one billion, ninety-three million, seven hundred thirty-nine thousand, one hundred twenty-one".