91111093 has 2 divisors, whose sum is σ = 91111094. Its totient is φ = 91111092.

The previous prime is 91111091. The next prime is 91111123. The reversal of 91111093 is 39011119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63632529 + 27478564 = 7977^2 + 5242^2 .

It is a cyclic number.

It is not a de Polignac number, because 91111093 - 2¹ = 91111091 is a prime.

Together with 91111091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91111091) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45555546 + 45555547.

It is an arithmetic number, because the mean of its divisors is an integer number (45555547).

Almost surely, 2^91111093 is an apocalyptic number.

It is an amenable number.

91111093 is a deficient number, since it is larger than the sum of its proper divisors (1).

91111093 is an equidigital number, since it uses as much as digits as its factorization.

91111093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 91111093 is about 9545.2130934830. The cubic root of 91111093 is about 449.9771066543.

The spelling of 91111093 in words is "ninety-one million, one hundred eleven thousand, ninety-three".