9991030320203 has 4 divisors (see below), whose sum is σ = 9991389698808. Its totient is φ = 9990670941600.

The previous prime is 9991030320169. The next prime is 9991030320211. The reversal of 9991030320203 is 3020230301999.

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 9991030320203 - 2⁸ = 9991030319947 is a prime.

It is a super-2 number, since 2×9991030320203² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9991030326203) 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, 179647598 + ... + 179703203.

It is an arithmetic number, because the mean of its divisors is an integer number (2497847424702).

Almost surely, 2^{9991030320203} is an apocalyptic number.

9991030320203 is a deficient number, since it is larger than the sum of its proper divisors (359378605).

9991030320203 is a wasteful number, since it uses less digits than its factorization.

9991030320203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359378604.

The product of its (nonzero) digits is 78732, while the sum is 41.

The spelling of 9991030320203 in words is "nine trillion, nine hundred ninety-one billion, thirty million, three hundred twenty thousand, two hundred three".