91222211 has 4 divisors (see below), whose sum is σ = 96023400. Its totient is φ = 86421024.

The previous prime is 91222207. The next prime is 91222213. The reversal of 91222211 is 11222219.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91222211 - 2² = 91222207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91222213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2400566 + ... + 2400603.

It is an arithmetic number, because the mean of its divisors is an integer number (24005850).

Almost surely, 2^91222211 is an apocalyptic number.

91222211 is a deficient number, since it is larger than the sum of its proper divisors (4801189).

91222211 is a wasteful number, since it uses less digits than its factorization.

91222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4801188.

The product of its digits is 144, while the sum is 20.

The square root of 91222211 is about 9551.0319337755. The cubic root of 91222211 is about 450.1599612389.

The spelling of 91222211 in words is "ninety-one million, two hundred twenty-two thousand, two hundred eleven".