891123227 has 2 divisors, whose sum is σ = 891123228. Its totient is φ = 891123226.

The previous prime is 891123203. The next prime is 891123229. The reversal of 891123227 is 722321198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891123227 - 2¹⁰ = 891122203 is a prime.

Together with 891123229, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (891123229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445561613 + 445561614.

It is an arithmetic number, because the mean of its divisors is an integer number (445561614).

Almost surely, 2^891123227 is an apocalyptic number.

891123227 is a deficient number, since it is larger than the sum of its proper divisors (1).

891123227 is an equidigital number, since it uses as much as digits as its factorization.

891123227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 891123227 is about 29851.6871717496. The cubic root of 891123227 is about 962.3046577656.

The spelling of 891123227 in words is "eight hundred ninety-one million, one hundred twenty-three thousand, two hundred twenty-seven".