891485891 has 2 divisors, whose sum is σ = 891485892. Its totient is φ = 891485890.

The previous prime is 891485867. The next prime is 891485921. The reversal of 891485891 is 198584198.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 891485891 - 2²⁶ = 824377027 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (891485851) 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, 445742945 + 445742946.

It is an arithmetic number, because the mean of its divisors is an integer number (445742946).

Almost surely, 2^891485891 is an apocalyptic number.

891485891 is a deficient number, since it is larger than the sum of its proper divisors (1).

891485891 is an equidigital number, since it uses as much as digits as its factorization.

891485891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 53.

The square root of 891485891 is about 29857.7609843739. The cubic root of 891485891 is about 962.4351843912.

The spelling of 891485891 in words is "eight hundred ninety-one million, four hundred eighty-five thousand, eight hundred ninety-one".