9991313311 has 4 divisors (see below), whose sum is σ = 11418643792. Its totient is φ = 8563982832.

The previous prime is 9991313303. The next prime is 9991313317. The reversal of 9991313311 is 1133131999.

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 9991313311 - 2³ = 9991313303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991313317) 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, 713665230 + ... + 713665243.

It is an arithmetic number, because the mean of its divisors is an integer number (2854660948).

Almost surely, 2^9991313311 is an apocalyptic number.

9991313311 is a deficient number, since it is larger than the sum of its proper divisors (1427330481).

9991313311 is a wasteful number, since it uses less digits than its factorization.

9991313311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427330480.

The product of its digits is 19683, while the sum is 40.

The square root of 9991313311 is about 99956.5571185803. The cubic root of 9991313311 is about 2153.8106791733.

The spelling of 9991313311 in words is "nine billion, nine hundred ninety-one million, three hundred thirteen thousand, three hundred eleven".