91222147 has 2 divisors, whose sum is σ = 91222148. Its totient is φ = 91222146.

The previous prime is 91222111. The next prime is 91222151. The reversal of 91222147 is 74122219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91222147 - 2²³ = 82833539 is a prime.

It is not a weakly prime, because it can be changed into another prime (91222177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45611073 + 45611074.

It is an arithmetic number, because the mean of its divisors is an integer number (45611074).

Almost surely, 2^91222147 is an apocalyptic number.

91222147 is a deficient number, since it is larger than the sum of its proper divisors (1).

91222147 is an equidigital number, since it uses as much as digits as its factorization.

91222147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 91222147 is about 9551.0285833516. The cubic root of 91222147 is about 450.1598559640.

The spelling of 91222147 in words is "ninety-one million, two hundred twenty-two thousand, one hundred forty-seven".