191055689 has 4 divisors (see below), whose sum is σ = 208424400. Its totient is φ = 173686980.

The previous prime is 191055671. The next prime is 191055691. The reversal of 191055689 is 986550191.

191055689 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 986550191 = 11 ⋅89686381.

It is a cyclic number.

It is not a de Polignac number, because 191055689 - 2⁸ = 191055433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191055649) 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, 8684339 + ... + 8684360.

It is an arithmetic number, because the mean of its divisors is an integer number (52106100).

Almost surely, 2^191055689 is an apocalyptic number.

It is an amenable number.

191055689 is a deficient number, since it is larger than the sum of its proper divisors (17368711).

191055689 is a wasteful number, since it uses less digits than its factorization.

191055689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17368710.

The product of its (nonzero) digits is 97200, while the sum is 44.

The square root of 191055689 is about 13822.2895715580. The cubic root of 191055689 is about 575.9524871190.

The spelling of 191055689 in words is "one hundred ninety-one million, fifty-five thousand, six hundred eighty-nine".