91011212 has 12 divisors (see below), whose sum is σ = 160816656. Its totient is φ = 45063600.

The previous prime is 91011211. The next prime is 91011227. The reversal of 91011212 is 21211019.

It is not an unprimeable number, because it can be changed into a prime (91011211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110039 + ... + 110862.

It is an arithmetic number, because the mean of its divisors is an integer number (13401388).

Almost surely, 2^91011212 is an apocalyptic number.

It is an amenable number.

91011212 is a deficient number, since it is larger than the sum of its proper divisors (69805444).

91011212 is a wasteful number, since it uses less digits than its factorization.

91011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221008 (or 221006 counting only the distinct ones).

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

The square root of 91011212 is about 9539.9796645486. The cubic root of 91011212 is about 449.8126166332.

The spelling of 91011212 in words is "ninety-one million, eleven thousand, two hundred twelve".