91109107 has 2 divisors, whose sum is σ = 91109108. Its totient is φ = 91109106.

The previous prime is 91109099. The next prime is 91109111. The reversal of 91109107 is 70190119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91109107 - 2³ = 91109099 is a prime.

It is not a weakly prime, because it can be changed into another prime (91109147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45554553 + 45554554.

It is an arithmetic number, because the mean of its divisors is an integer number (45554554).

Almost surely, 2^91109107 is an apocalyptic number.

91109107 is a deficient number, since it is larger than the sum of its proper divisors (1).

91109107 is an equidigital number, since it uses as much as digits as its factorization.

91109107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 91109107 is about 9545.1090617132. The cubic root of 91109107 is about 449.9738371621.

The spelling of 91109107 in words is "ninety-one million, one hundred nine thousand, one hundred seven".