891121121227 has 2 divisors, whose sum is σ = 891121121228. Its totient is φ = 891121121226.

The previous prime is 891121121161. The next prime is 891121121237. The reversal of 891121121227 is 722121121198.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891121121227 is a prime.

It is not a weakly prime, because it can be changed into another prime (891121121237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445560560613 + 445560560614.

It is an arithmetic number, because the mean of its divisors is an integer number (445560560614).

Almost surely, 2^891121121227 is an apocalyptic number.

891121121227 is a deficient number, since it is larger than the sum of its proper divisors (1).

891121121227 is an equidigital number, since it uses as much as digits as its factorization.

891121121227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 37.

The spelling of 891121121227 in words is "eight hundred ninety-one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-seven".