191106869 has 2 divisors, whose sum is σ = 191106870. Its totient is φ = 191106868.

The previous prime is 191106823. The next prime is 191106871. The reversal of 191106869 is 968601191.

It is a happy number.

191106869 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., 185640625 + 5466244 = 13625^2 + 2338^2 .

It is an emirp because it is prime and its reverse (968601191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191106869 - 2¹² = 191102773 is a prime.

It is a super-2 number, since 2×191106869² = 73043670757966322, which contains 22 as substring.

Together with 191106871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191106169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95553434 + 95553435.

It is an arithmetic number, because the mean of its divisors is an integer number (95553435).

Almost surely, 2^191106869 is an apocalyptic number.

It is an amenable number.

191106869 is a deficient number, since it is larger than the sum of its proper divisors (1).

191106869 is an equidigital number, since it uses as much as digits as its factorization.

191106869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 191106869 is about 13824.1408051278. The cubic root of 191106869 is about 576.0039112469.

The spelling of 191106869 in words is "one hundred ninety-one million, one hundred six thousand, eight hundred sixty-nine".