91122011 has 2 divisors, whose sum is σ = 91122012. Its totient is φ = 91122010.

The previous prime is 91122001. The next prime is 91122029. The reversal of 91122011 is 11022119.

It is a weak prime.

It is an emirp because it is prime and its reverse (11022119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91122011 - 2²⁶ = 24013147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91122001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45561005 + 45561006.

It is an arithmetic number, because the mean of its divisors is an integer number (45561006).

Almost surely, 2^91122011 is an apocalyptic number.

91122011 is a deficient number, since it is larger than the sum of its proper divisors (1).

91122011 is an equidigital number, since it uses as much as digits as its factorization.

91122011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 91122011 is about 9545.7849860554. The cubic root of 91122011 is about 449.9950797816.

It can be divided in two parts, 911 and 22011, that added together give a palindrome (22922).

The spelling of 91122011 in words is "ninety-one million, one hundred twenty-two thousand, eleven".