991316085 has 16 divisors (see below), whose sum is σ = 1586828544. Its totient is φ = 528460992.

The previous prime is 991316083. The next prime is 991316101. The reversal of 991316085 is 580613199.

991316085 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 991316085 - 2¹ = 991316083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991316083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21879 + ... + 49611.

It is an arithmetic number, because the mean of its divisors is an integer number (99176784).

Almost surely, 2^991316085 is an apocalyptic number.

It is an amenable number.

991316085 is a deficient number, since it is larger than the sum of its proper divisors (595512459).

991316085 is a wasteful number, since it uses less digits than its factorization.

991316085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30124.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 991316085 is about 31485.1724626053. The cubic root of 991316085 is about 997.0969420768.

The spelling of 991316085 in words is "nine hundred ninety-one million, three hundred sixteen thousand, eighty-five".