11911911 has 16 divisors (see below), whose sum is σ = 17539200. Its totient is φ = 7130720.

The previous prime is 11911873. The next prime is 11911919.

11911911 is nontrivially palindromic in base 10.

11911911 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11911911 - 2¹⁰ = 11910887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11911919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (1096200).

Almost surely, 2^11911911 is an apocalyptic number.

11911911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11911911 is a deficient number, since it is larger than the sum of its proper divisors (5627289).

11911911 is a wasteful number, since it uses less digits than its factorization.

11911911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446.

The product of its digits is 81, while the sum is 24.

The square root of 11911911 is about 3451.3636435473. The cubic root of 11911911 is about 228.3812680485.

The spelling of 11911911 in words is "eleven million, nine hundred eleven thousand, nine hundred eleven".