991160813485 has 8 divisors (see below), whose sum is σ = 1189398393720. Its totient is φ = 792925039104.

The previous prime is 991160813483. The next prime is 991160813497. The reversal of 991160813485 is 584318061199.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 71213192164 + 919947621321 = 266858^2 + 959139^2 .

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 991160813485 - 2¹ = 991160813483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991160813483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1620549 + ... + 2146741.

It is an arithmetic number, because the mean of its divisors is an integer number (148674799215).

Almost surely, 2^991160813485 is an apocalyptic number.

It is an amenable number.

991160813485 is a deficient number, since it is larger than the sum of its proper divisors (198237580235).

991160813485 is a wasteful number, since it uses less digits than its factorization.

991160813485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902927.

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 991160813485 in words is "nine hundred ninety-one billion, one hundred sixty million, eight hundred thirteen thousand, four hundred eighty-five".