891873491041 has 4 divisors (see below), whose sum is σ = 960479144212. Its totient is φ = 823267837872.

The previous prime is 891873491021. The next prime is 891873491071. The reversal of 891873491041 is 140194378198.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83859472225 + 808014018816 = 289585^2 + 898896^2 .

It is a cyclic number.

It is not a de Polignac number, because 891873491041 - 2¹³ = 891873482849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891873491021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34302826566 + ... + 34302826591.

It is an arithmetic number, because the mean of its divisors is an integer number (240119786053).

Almost surely, 2^891873491041 is an apocalyptic number.

It is an amenable number.

891873491041 is a deficient number, since it is larger than the sum of its proper divisors (68605653171).

891873491041 is a wasteful number, since it uses less digits than its factorization.

891873491041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68605653170.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 891873491041 in words is "eight hundred ninety-one billion, eight hundred seventy-three million, four hundred ninety-one thousand, forty-one".