9909911 has 8 divisors (see below), whose sum is σ = 10879104. Its totient is φ = 8952120.

The previous prime is 9909901. The next prime is 9909917. The reversal of 9909911 is 1199099.

It is a happy number.

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 9909911 - 2⁶ = 9909847 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 (9909917) 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, 971 + ... + 4556.

It is an arithmetic number, because the mean of its divisors is an integer number (1359888).

Almost surely, 2^9909911 is an apocalyptic number.

9909911 is a deficient number, since it is larger than the sum of its proper divisors (969193).

9909911 is a wasteful number, since it uses less digits than its factorization.

9909911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5701.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 9909911 is about 3148.0011118168. The cubic root of 9909911 is about 214.7945468367.

It can be divided in two parts, 990 and 9911, that added together give a palindrome (10901).

The spelling of 9909911 in words is "nine million, nine hundred nine thousand, nine hundred eleven".