891159993 has 24 divisors (see below), whose sum is σ = 1322953632. Its totient is φ = 577741248.

The previous prime is 891159991. The next prime is 891160027. The reversal of 891159993 is 399951198.

891159993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 891159993 - 2¹ = 891159991 is a prime.

It is a super-2 number, since 2×891159993² = 1588332266247520098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (891159991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85230 + ... + 95112.

It is an arithmetic number, because the mean of its divisors is an integer number (55123068).

Almost surely, 2^891159993 is an apocalyptic number.

It is an amenable number.

891159993 is a deficient number, since it is larger than the sum of its proper divisors (431793639).

891159993 is a wasteful number, since it uses less digits than its factorization.

891159993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10165 (or 10162 counting only the distinct ones).

The product of its digits is 787320, while the sum is 54.

The square root of 891159993 is about 29852.3029764874. The cubic root of 891159993 is about 962.3178918524.

The spelling of 891159993 in words is "eight hundred ninety-one million, one hundred fifty-nine thousand, nine hundred ninety-three".