91222891 has 2 divisors, whose sum is σ = 91222892. Its totient is φ = 91222890.

The previous prime is 91222889. The next prime is 91222903. The reversal of 91222891 is 19822219.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91222891 - 2¹ = 91222889 is a prime.

Together with 91222889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91222841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45611445 + 45611446.

It is an arithmetic number, because the mean of its divisors is an integer number (45611446).

Almost surely, 2^91222891 is an apocalyptic number.

91222891 is a deficient number, since it is larger than the sum of its proper divisors (1).

91222891 is an equidigital number, since it uses as much as digits as its factorization.

91222891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 91222891 is about 9551.0675319568. The cubic root of 91222891 is about 450.1610797824.

The spelling of 91222891 in words is "ninety-one million, two hundred twenty-two thousand, eight hundred ninety-one".