9919911 has 8 divisors (see below), whose sum is σ = 13386240. Its totient is φ = 6533432.

The previous prime is 9919883. The next prime is 9919933. The reversal of 9919911 is 1199199.

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 9919911 - 2²³ = 1531303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9919911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9914911) 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, 19671 + ... + 20168.

It is an arithmetic number, because the mean of its divisors is an integer number (1673280).

Almost surely, 2^9919911 is an apocalyptic number.

9919911 is a deficient number, since it is larger than the sum of its proper divisors (3466329).

9919911 is a wasteful number, since it uses less digits than its factorization.

9919911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39925.

The product of its digits is 6561, while the sum is 39.

The square root of 9919911 is about 3149.5890208089. The cubic root of 9919911 is about 214.8667716152.

The spelling of 9919911 in words is "nine million, nine hundred nineteen thousand, nine hundred eleven".