9991011 has 8 divisors (see below), whose sum is σ = 13353984. Its totient is φ = 6644360.

The previous prime is 9990997. The next prime is 9991027. The reversal of 9991011 is 1101999.

9991011 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 9991011 - 2⁹ = 9990499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9991011.

It is not an unprimeable number, because it can be changed into a prime (9991211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2571 + ... + 5156.

It is an arithmetic number, because the mean of its divisors is an integer number (1669248).

Almost surely, 2^9991011 is an apocalyptic number.

9991011 is a deficient number, since it is larger than the sum of its proper divisors (3362973).

9991011 is a wasteful number, since it uses less digits than its factorization.

9991011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8161.

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 9991011 is about 3160.8560549320. The cubic root of 9991011 is about 215.3788956062.

The spelling of 9991011 in words is "nine million, nine hundred ninety-one thousand, eleven".