891411109 has 2 divisors, whose sum is σ = 891411110. Its totient is φ = 891411108.

The previous prime is 891411091. The next prime is 891411139. The reversal of 891411109 is 901114198.

891411109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (891411091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 884765025 + 6646084 = 29745^2 + 2578^2 .

It is a cyclic number.

It is not a de Polignac number, because 891411109 - 2⁷ = 891410981 is a prime.

It is a super-2 number, since 2×891411109² = 1589227530497219762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891411139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445705554 + 445705555.

It is an arithmetic number, because the mean of its divisors is an integer number (445705555).

Almost surely, 2^891411109 is an apocalyptic number.

It is an amenable number.

891411109 is a deficient number, since it is larger than the sum of its proper divisors (1).

891411109 is an equidigital number, since it uses as much as digits as its factorization.

891411109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 34.

The square root of 891411109 is about 29856.5086538932. The cubic root of 891411109 is about 962.4082724526.

The spelling of 891411109 in words is "eight hundred ninety-one million, four hundred eleven thousand, one hundred nine".