891308985 has 32 divisors (see below), whose sum is σ = 1641745152. Its totient is φ = 404474880.

The previous prime is 891308983. The next prime is 891309007. The reversal of 891308985 is 589803198.

It is not a de Polignac number, because 891308985 - 2¹ = 891308983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (891308983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16596 + ... + 45365.

It is an arithmetic number, because the mean of its divisors is an integer number (51304536).

Almost surely, 2^891308985 is an apocalyptic number.

It is an amenable number.

891308985 is a deficient number, since it is larger than the sum of its proper divisors (750436167).

891308985 is a wasteful number, since it uses less digits than its factorization.

891308985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62113.

The product of its (nonzero) digits is 622080, while the sum is 51.

The square root of 891308985 is about 29854.7983580529. The cubic root of 891308985 is about 962.3715184660.

The spelling of 891308985 in words is "eight hundred ninety-one million, three hundred eight thousand, nine hundred eighty-five".