191304089 has 2 divisors, whose sum is σ = 191304090. Its totient is φ = 191304088.

The previous prime is 191304031. The next prime is 191304101. The reversal of 191304089 is 980403191.

191304089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100902025 + 90402064 = 10045^2 + 9508^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191304089 is a prime.

It is not a weakly prime, because it can be changed into another prime (191304389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95652044 + 95652045.

It is an arithmetic number, because the mean of its divisors is an integer number (95652045).

Almost surely, 2^191304089 is an apocalyptic number.

It is an amenable number.

191304089 is a deficient number, since it is larger than the sum of its proper divisors (1).

191304089 is an equidigital number, since it uses as much as digits as its factorization.

191304089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 191304089 is about 13831.2721396117. The cubic root of 191304089 is about 576.2019861715.

The spelling of 191304089 in words is "one hundred ninety-one million, three hundred four thousand, eighty-nine".