191089089 has 6 divisors (see below), whose sum is σ = 276017586. Its totient is φ = 127392720.

The previous prime is 191089081. The next prime is 191089111. The reversal of 191089089 is 980980191.

191089089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 157251600 + 33837489 = 12540^2 + 5817^2 .

It is not a de Polignac number, because 191089089 - 2³ = 191089081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191089081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10616052 + ... + 10616069.

It is an arithmetic number, because the mean of its divisors is an integer number (46002931).

Almost surely, 2^191089089 is an apocalyptic number.

It is an amenable number.

191089089 is a deficient number, since it is larger than the sum of its proper divisors (84928497).

191089089 is a wasteful number, since it uses less digits than its factorization.

191089089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21232127 (or 21232124 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 191089089 is about 13823.4977122290. The cubic root of 191089089 is about 575.9860474774.

The spelling of 191089089 in words is "one hundred ninety-one million, eighty-nine thousand, eighty-nine".