991303317076 has 54 divisors (see below), whose sum is σ = 1847703370478. Its totient is φ = 465263550720.

The previous prime is 991303317049. The next prime is 991303317079. The reversal of 991303317076 is 670713303199.

It can be written as a sum of positive squares in 3 ways, for example, as 350144392900 + 641158924176 = 591730^2 + 800724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991303317079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 787372935 + ... + 787374193.

Almost surely, 2^991303317076 is an apocalyptic number.

It is an amenable number.

991303317076 is a deficient number, since it is larger than the sum of its proper divisors (856400053402).

991303317076 is a wasteful number, since it uses less digits than its factorization.

991303317076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097 (or 1819 counting only the distinct ones).

The product of its (nonzero) digits is 642978, while the sum is 49.

The spelling of 991303317076 in words is "nine hundred ninety-one billion, three hundred three million, three hundred seventeen thousand, seventy-six".