891328717891 has 8 divisors (see below), whose sum is σ = 930914828064. Its totient is φ = 851811998400.

The previous prime is 891328717871. The next prime is 891328717927. The reversal of 891328717891 is 198717823198.

891328717891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 891328717891 - 2⁹ = 891328717379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891328717871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17321410 + ... + 17372791.

It is an arithmetic number, because the mean of its divisors is an integer number (116364353508).

Almost surely, 2^891328717891 is an apocalyptic number.

891328717891 is a deficient number, since it is larger than the sum of its proper divisors (39586110173).

891328717891 is a wasteful number, since it uses less digits than its factorization.

891328717891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34695341.

The product of its digits is 12192768, while the sum is 64.

The spelling of 891328717891 in words is "eight hundred ninety-one billion, three hundred twenty-eight million, seven hundred seventeen thousand, eight hundred ninety-one".