91109099 has 2 divisors, whose sum is σ = 91109100. Its totient is φ = 91109098.

The previous prime is 91109087. The next prime is 91109107. The reversal of 91109099 is 99090119.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91109099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91109299) 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, 45554549 + 45554550.

It is an arithmetic number, because the mean of its divisors is an integer number (45554550).

Almost surely, 2^91109099 is an apocalyptic number.

91109099 is a deficient number, since it is larger than the sum of its proper divisors (1).

91109099 is an equidigital number, since it uses as much as digits as its factorization.

91109099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 91109099 is about 9545.1086426504. The cubic root of 91109099 is about 449.9738239918.

The spelling of 91109099 in words is "ninety-one million, one hundred nine thousand, ninety-nine".