991012310303 has 4 divisors (see below), whose sum is σ = 991020592320. Its totient is φ = 991004028288.

The previous prime is 991012310297. The next prime is 991012310329. The reversal of 991012310303 is 303013210199.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 991012310303 - 2⁴ = 991012310287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 991012310303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991012310003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3958850 + ... + 4201727.

It is an arithmetic number, because the mean of its divisors is an integer number (247755148080).

Almost surely, 2^991012310303 is an apocalyptic number.

991012310303 is a deficient number, since it is larger than the sum of its proper divisors (8282017).

991012310303 is a wasteful number, since it uses less digits than its factorization.

991012310303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8282016.

The product of its (nonzero) digits is 4374, while the sum is 32.

The spelling of 991012310303 in words is "nine hundred ninety-one billion, twelve million, three hundred ten thousand, three hundred three".