11999911 has 16 divisors (see below), whose sum is σ = 15118848. Its totient is φ = 9252000.

The previous prime is 11999903. The next prime is 11999927.

11999911 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 11999911 - 2³ = 11999903 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11999941) 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, 7006 + ... + 8548.

It is an arithmetic number, because the mean of its divisors is an integer number (944928).

Almost surely, 2^11999911 is an apocalyptic number.

11999911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11999911 is a deficient number, since it is larger than the sum of its proper divisors (3118937).

11999911 is a wasteful number, since it uses less digits than its factorization.

11999911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662.

The product of its digits is 6561, while the sum is 40.

The square root of 11999911 is about 3464.0887690704. The cubic root of 11999911 is about 228.9422825117.

The spelling of 11999911 in words is "eleven million, nine hundred ninety-nine thousand, nine hundred eleven".