91121227 has 2 divisors, whose sum is σ = 91121228. Its totient is φ = 91121226.

The previous prime is 91121213. The next prime is 91121237. The reversal of 91121227 is 72212119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91121227 - 2²³ = 82732619 is a prime.

It is not a weakly prime, because it can be changed into another prime (91121237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45560613 + 45560614.

It is an arithmetic number, because the mean of its divisors is an integer number (45560614).

Almost surely, 2^91121227 is an apocalyptic number.

91121227 is a deficient number, since it is larger than the sum of its proper divisors (1).

91121227 is an equidigital number, since it uses as much as digits as its factorization.

91121227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 25.

The square root of 91121227 is about 9545.7439207219. The cubic root of 91121227 is about 449.9937892147.

The spelling of 91121227 in words is "ninety-one million, one hundred twenty-one thousand, two hundred twenty-seven".