885005991 has 6 divisors (see below), whose sum is σ = 1278342000. Its totient is φ = 590003988.

The previous prime is 885005969. The next prime is 885006007. The reversal of 885005991 is 199500588.

885005991 is a `hidden beast` number, since 8 + 8 + 50 + 0 + 599 + 1 = 666.

It is not a de Polignac number, because 885005991 - 2¹⁵ = 884973223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (885005591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49166991 + ... + 49167008.

It is an arithmetic number, because the mean of its divisors is an integer number (213057000).

Almost surely, 2^885005991 is an apocalyptic number.

885005991 is a deficient number, since it is larger than the sum of its proper divisors (393336009).

885005991 is a wasteful number, since it uses less digits than its factorization.

885005991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98334005 (or 98334002 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 885005991 is about 29749.0502537476. The cubic root of 885005991 is about 960.0976430630.

The spelling of 885005991 in words is "eight hundred eighty-five million, five thousand, nine hundred ninety-one".